Translate the Phrase : "" Nine times the difference of a number and 3"" into an Algebraic Expression and then Simplify . Let X represent the real number . ​

Answer:

Step-by-step explanation:

These are linear functions. The graph is a straight line. We only need two points to draw a graph.

We choose any two values of x, substitute and calculate the value of y.

For y = -2x + 3

x = 0 → y =-2(0) + 3 = 0 + 3 = 3 → (0, 3)

x = 1 → y = -2(1) + 3 = - 2 + 3 = 1 → (1, 1)

For y = -4x + 15

x = 3 → y = -4(3) + 15 = -12 + 15 = 3 → (3, 3)

x = 4 → y = -4(4) + 15 = -16 + 15 = -1 → (4, -1)

Look at the picture.

The solution is the coordinates of the point of intersection of lines.

The solution to the system of equations below when graphed is (6, -9).

In order to graphically determine the solution for this system of linear equations on a coordinate plane, we would make use of an online graphing calculator to plot the given system of linear equations while taking note of the point of intersection.

When x is 0, 3, and 6, the y-value is given by;

y= -2(0) +3 = 3

y= -2(3) +3 = -3

y= -2(6) +3 = -9

y= -4(0) + 15 = 11

y= -4(3) + 15 = 3

y= -4(6) + 15 = -9

Since the y-intercept is at (0, 3) and the slope is 3, we would start with the point (0, 3), move 1 unit to the right and 3 units upward for the remaining points. For the second equation, the y-intercept is at (0, 15) and the slope is -4, we would start with the point (0, 15), move 1 unit to the right and 4 units downward for the remaining points.

Based on the graph shown, the solution set to the system is represented by the purple shaded region. Hence, a possible solution is (6, -9).

Answer:

Step-by-step explanation:

Your first step is to find the total number of animals, no matter what they are.

34 + 27 + 12 + 16 + 22 = 111 animals.

You could add all the numbers other than the 12 hippopotamuses together. If you did, you would get 99.

The answer is 99/111 = 0.892

Sometimes it is just easier to do the following. Find the the probability of getting a hippo and subtract that from 1.

12/111 = 0.108

And subtract this number from 1. One represents all of the possible animals.

1 - 0.108 = 0.892

Later on, when you get problems that are more complicated, the second way is the way to do it. It gives you lest grief.

I'm going to assume this reads

[tex]\vec F(x,y,z)=5e^x\sin y\,\vec\imath+5e^x\cos y\,\vec\jmath+7z^2\,\vec k[/tex]

and the path [tex]C[/tex] is parameterized by

[tex]\vec c(t)=8t\,\vec\imath+t^3\,\vec\jmath+e^t\,\vec k[/tex]

with [tex]0\le t\le1[/tex]. Under this parameterization,

[tex]\vec F(x,y,z)=\vec F(x(t),y(t),z(t))=5e^{8t}\sin(t^3)\,\vec\imath+5e^{8t}\cos(t^3)\,\vec\jmath+7e^{2t}\,\vec k[/tex]

and

[tex]\mathrm d\vec c=\dfrac{\mathrm d\vec c}{\mathrm dt}\,\mathrm dt=(8\,\vec\imath+3t^2\,\vec\jmath+e^t\,\vec k)\,\mathrm dt[/tex]

Then in the integral,

[tex]\displaystyle\int_C\vec F\cdot\mathrm d\vec s=\int_0^1\vec F(x(t),y(t),z(t))\cdot\frac{\mathrm d\vec c}{\mathrm dt}\,\mathrm dt[/tex]

[tex]=\displaystyle\int_0^1(7e^{3t}+15e^{8t}t^2\cos(t^3)+40e^{8t}\sin(t^3))\,\mathrm dt\approx\boxed{12586.5}[/tex]

(It's unlikely that an exact answer can be found in terms of elementary functions)

Answer:

The mass of the lamina is 1

Step-by-step explanation:

Let [tex]\rho(x,y)[/tex] be a continuous density function of a lamina in the plane region D,then the mass of the lamina is given by:

[tex]m=\int\limits \int\limits_D \rho(x,y) \, dA[/tex].

From the question, the given density function is [tex]\rho (x,y)=xye^{x+y}[/tex].

Again, the lamina occupies a rectangular region: D={(x, y) : 0 ≤ x ≤ 1, 0 ≤ y ≤ 1}.

The mass of the lamina can be found by evaluating the double integral:

[tex]I=\int\limits^1_0\int\limits^1_0xye^{x+y}dydx[/tex].

Since D is a rectangular region, we can apply Fubini's Theorem to get:

[tex]I=\int\limits^1_0(\int\limits^1_0xye^{x+y}dy)dx[/tex].

Let the inner integral be: [tex]I_0=\int\limits^1_0xye^{x+y}dy[/tex], then

[tex]I=\int\limits^1_0(I_0)dx[/tex].

The inner integral is evaluated using integration by parts.

Let [tex]u=xy[/tex], the partial derivative of u wrt y is

[tex]\implies du=xdy[/tex]

and

[tex]dv=\int\limits e^{x+y} dy[/tex], integrating wrt y, we obtain

[tex]v=\int\limits e^{x+y}[/tex]

Recall the integration by parts formula:[tex]\int\limits udv=uv- \int\limits vdu[/tex]

This implies that:

[tex]\int\limits xye^{x+y}dy=xye^{x+y}-\int\limits e^{x+y}\cdot xdy[/tex]

[tex]\int\limits xye^{x+y}dy=xye^{x+y}-xe^{x+y}[/tex]

[tex]I_0=\int\limits^1_0 xye^{x+y}dy[/tex]

We substitute the limits of integration and evaluate to get:

[tex]I_0=xe^x[/tex]

This implies that:

[tex]I=\int\limits^1_0(xe^x)dx[/tex].

Or

[tex]I=\int\limits^1_0xe^xdx[/tex].

We again apply integration by parts formula to get:

[tex]\int\limits xe^xdx=e^x(x-1)[/tex].

[tex]I=\int\limits^1_0xe^xdx=e^1(1-1)-e^0(0-1)[/tex].

[tex]I=\int\limits^1_0xe^xdx=0-1(0-1)[/tex].

[tex]I=\int\limits^1_0xe^xdx=0-1(-1)=1[/tex].

No unit is given, therefore the mass of the lamina is 1.

The mass of the lamina is (1 − e)/2 units.

To find the mass of the lamina occupying the region D = {(x, y) : 0 ≤ x ≤ 1, 0 ≤ y ≤ 1} with the density function ρ(x, y) = xy[tex]e^{(x+y)[/tex] , we need to calculate the double integral of the density function over the given region.

M = ∬D ρ(x,y) dA

Since D is a rectangular region, we can write:

M = ∫01 ∫01 xy [tex]e^{(x+y)[/tex] dy dx

∫01 xy [tex]e^{(x+y)[/tex] dy = x ∫01 y [tex]e^{(x+y)[/tex] dy

Using integration by parts where u = y, dv = [tex]e^{(x+y)[/tex] dy:

∫ y [tex]e^{(x+y)[/tex] dy = [y [tex]e^{(x+y)[/tex] / ex] 01 - ∫ [tex]e^{(x+y)[/tex] / ex dy

= [y [tex]e^{(x+y)[/tex]] 01 - [[tex]e^{(x+y)[/tex]] 01

= [[tex]e^{(x+1)[/tex]) - eˣ - [tex]e^{(x+1)[/tex] + e⁰]/eˣ

= x (1 − e¹)

∫01 x (1 − e¹) dx = (1 − e¹) ∫01 x dx

= (1 − e¹) [x2 / 2] 01

= (1 − e¹)(1/2)

= (1 − e¹)/2

The mass of the lamina is (1 − e)/2 units.

Answer:

Company's total liabilities are $6,351.

Step-by-step explanation:

A company's financial information is given, we have to calculate the company's total liabilities.

Total assets = Fixed assets + current assets

Current assets = Total assets - Fixed assets

                         = $8,190 - $5,385

                         = $2,805

Networking capital = Current assets - Current liabilities

                        $735 = $2,805 - current liabilities

  Current liabilities   = $2,805 - $735

  Current liabilities   = $2,070

Total liabilities = Long term debt + current liabilities

                         = $4,281 + $2,070

                         = $6,351

Company's total liabilities are $6,351.

Note that adding the first two equations gives

[tex](4x-y+3z)+(x+4y+6z)=12+(-32)\implies5x+3y+9z=-20[/tex]

But the third equation says [tex]5x+3y+9z=20[/tex], so there is no solution.

Final answer:

At a 99% confidence level, the estimated mean amount spent for lunch is given by the sample mean with a margin of error of $2.900, resulting in a confidence interval.

Explanation:

To calculate the margin of error at a 99% confidence level, we need to use the formula: Margin of Error = Z * (Population Standard Deviation / √Sample Size). Here, the Z-value for a 99% confidence level is 2.576. The sample size is 64 and the population standard deviation is $9. Plugging in these values, we get: Margin of Error = 2.576 * (9 / √64) = 2.576 * 1.125 = 2.900. So, the margin of error is $2.900.

To develop a 99% confidence interval estimate of the mean amount spent for lunch, we need to use the formula: Confidence Interval = Sample Mean ± Margin of Error. The sample mean is the average of the lunch amounts provided in the data file. Plugging in the values, we get: Confidence Interval = Sample Mean ± 2.900. Here, the Sample Mean is the average of the lunch amounts and the Margin of Error is $2.900.

Answer:

A

Step-by-step explanation:

14 is A because its dividing and operating

Answer:

D, D

Step-by-step explanation:

Nickels are $0.05, Dimes are $0.10 and quarters are $0.25

Simply work out the options and see which one gives you $1.95

A) By observation, we see that this combination has 16 coins, but the question says only 15 coins. Hence we can remove this as an option.

B) 5($0.05) + 7($0.10) + 3($0.25) = $1.70 ≠ $1.95 (wrong)

C) 7($0.05) + 6($0.10) + 2($0.25) = $1.45 ≠ $1.95 (wrong)

D) 3($0.05) + 8($0.10) + 4($0.25) = $1.95 (Correct)

FOr next question, D is not a function because if you observe the values in D, an input of 7 should give 11 i.e (7,11), but there is another option where 7 gives an output of 13 i.e (7,13).

Because for a function to be valid, one input cannot give 2 different outputs, D is not a function.

===========================================================

Explanation:

Recall that the margin of error (MOE) is defined as

MOE = z*s/sqrt(n)

The sample size n is located in the denominator, meaning that as n gets bigger, the MOE gets smaller. The same happens in reverse: as n gets smaller, the MOE gets bigger.

Put another way, a small sample size means we have more error because small samples mean they are less representative of the population at large. The bigger a sample is, the better estimate we will have of the parameter.

We are told that "sample A had a larger sample size" indicating that sample A has a more narrow confidence interval.

Therefore, sample B would have a wider confidence interval.

This is true regardless of what the confidence level is set at.

Sample B as it has the smaller sample size.Therefore, sample B, with the smaller sample size, will have a wider 95% confidence interval compared to sample A.

The width of a confidence interval is inversely proportional to the sample size. A larger sample size results in a narrower confidence interval, and a smaller sample size results in a wider confidence interval. Since both samples have the same mean and standard deviation, the only factor affecting the width of the confidence interval is the sample size.

The confidence interval is a range of values that is likely to contain the true population parameter with a certain level of confidence. In other words, it is an estimate of the range of values within which the true population parameter lies.

The width of the confidence interval is influenced by several factors, including the level of confidence, sample size, and variability of the data. When the sample size is larger, the estimate of the population parameter becomes more precise, resulting in a narrower confidence interval. Conversely, when the sample size is smaller, the estimate becomes less precise, resulting in a wider confidence interval.

In this scenario, both samples have the same mean and standard deviation, indicating that they have similar variability. However, sample A has a larger sample size than sample B. Therefore, sample A's estimate of the population parameter is likely to be more precise than sample B's estimate. This increased precision results in a narrower confidence interval for sample A compared to sample B. Therefore, sample B will have a wider 95% confidence interval compared to sample A.

Learn more about confidence  here: brainly.com/question/29048041

#SPJ11

Answer:

length: 2sqrt(2)

width: 4

Step-by-step explanation:

Let the x-coordinate of the right lower vertex be x. Then the x-coordinate of the left lower vertex is -x. The distance between x and -x is 2x, so the lower side of the rectangle, that rests on the x-axis, measures 2x. The length of the rectangle is 2x.

We now use the equation of the parabola to find the y-coordinate of the upper vertices. y = 6 - 2^x. If you plug in x for x, naturally you get y = 6 - x^2, so the y-coordinates of the two upper vertices are 6 - x^2. Since the y-coordinates of the lower vertices is 0, the vertical sides of the rectangle have length 6 - x^2. The width of the rectangle is 6 - x^2.

We have a rectangle with length 2x and width 6 - x^2.

Now we can find the area of the rectangle.

area = length * width

A = 2x(6 - x^2)

A = 12x - 2x^3

To find a maximum value of x, we differentiate the expression for the area with respect to x, set the derivative equal to zero, and solve for x.

dA/dx = 12 - 6x^2

We set the derivative equal to zero and solve for x.

12 - 6x^2 = 0

2 - x^2 = 0

x^2 = 2

x = +/- sqrt(2)

length = 2x = 2 * sqrt(2) = 2sqrt(2)

width = 6 - x^2 = 6 - (sqrt(2))^2 = 6 - 2 = 4

Final answer:

The greatest possible area of a rectangle inscribed under the parabola y = 6 - x² is achieved with dimensions 2√3 (width) by 3 (height), obtained by optimizing the area function using calculus.

Explanation:

To find the dimensions of the rectangle with the greatest possible area that is inscribed with its base on the x-axis and its upper corners on the parabola y = 6 - x², we apply the optimization technique in calculus.

Let the x-coordinate of the rectangle's upper corners be x, which means that the width of the rectangle is 2x (since the parabola is symmetric with respect to the y-axis). The height of the rectangle is given by the y-coordinate on the parabola, which is 6 - x².

Therefore, the area A of the rectangle can be expressed as A = 2x(6 - x²). To find the maximum area, we take the derivative of A with respect to x and set it to zero, solving for x.

A'(x) = 2(6 - x²) - 4x²(x). Setting A'(x) = 0 gives us x = √3. The maximum area occurs when x = √3, so the width of the rectangle will be 2√3 and the height will be 6 - 3, which simplifies to 3.

Hence, the rectangle with the greatest possible area has dimensions of 2√3 by 3.

Check the picture below.  So the bridge more or less looks like so.

since we know the vertex, we'll use that, and we also know a point on the parabola as well, namely (16,0).

[tex]\bf ~~~~~~\textit{parabola vertex form} \\\\ \begin{array}{llll} \stackrel{\textit{we'll use this one}}{y=a(x- h)^2+ k}\\\\ x=a(y- k)^2+ h \end{array} \qquad\qquad vertex~~(\stackrel{}{ h},\stackrel{}{ k}) \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ \begin{cases} h=8\\ k=2 \end{cases}\implies y=a(x-8)^2+2\qquad (16,0)~~ \begin{cases} x=16\\ y=0 \end{cases}[/tex]

[tex]\bf 0=a(16-8)^2+2\implies -2 = a(8)^2\implies -2=64a \\\\\\ \cfrac{-2}{64}=a\implies \cfrac{-1}{32}=a \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill y=-\cfrac{1}{32}(x-8)^2+2~\hfill[/tex]

Final answer:

The function that models the surface of the pedestrian bridge as a parabola with vertex at (8,2) is y = -(1/32)(x - 8)² + 2.

Explanation:

To find the function that models the surface of the pedestrian bridge, we can use  the vertex form of a parabolic equation, which is y = a(x - h)² + k, where (h,k) is the vertex. Since the bridge is 2 feet higher in the center than at the ends, we have the vertex at (8,2). This point gives us h = 8 and k = 2. Additionally, because the bridge starts and ends at ground level, we have two points that the parabola passes through: (0,0) and (16,0).

To find the value of 'a', we substitute one of the points into the equation. Let's use the point (16,0):

0 = a(16 - 8)² + 2  => 0 = a(8)² + 2  => 0 = 64a + 2  => -2 = 64a  => a = -2/64  => a = -1/32

Now we have all we need to write the function in vertex form:

y = -(1/32)(x - 8)² + 2

This equation models the surface of the bridge as a parabola, with the vertex at the center of the bridge and the sides touching the ground.

Answer: 0.6915

Step-by-step explanation:

Given : [tex]\text{Mean}=\mu=10^{\circ}C[/tex]

[tex]\text{Standard deviation}=\sigma=10^{\circ}C[/tex]

Since , the distribution follows a Normal distribution.

The formula to calculate the z-score is given by :-

[tex]z=\dfrac{x-\mu}{\sigma}[/tex]

For x=[tex]15^{\circ}C[/tex]

[tex]z=\dfrac{15-10}{10}=0.5[/tex]

The p-value = [tex]P(z\leq0.5)=0.6914625\approx0.6915[/tex]

Hence, the required probability : 0.6915

The probability that the temperature will be less than or equal to 15 degrees Celsius in a city with a mean temperature of 10 degrees Celsius and a standard deviation of 10 degrees Celsius is approximately 69.15%.

To find the probability that the temperature will be less than or equal to 15 degrees Celsius when the mean and standard deviation are both 10 degrees Celsius, we can calculate the z-score.

The z-score formula is:

z = (X - μ) / Σ

For X = 15, μ = 10, and Σ = 10, the z-score is:

z = (15 - 10) / 10 = 0.5

We then look up the z-score of 0.5 in a standard normal distribution table or use a calculator to find the cumulative probability corresponding to the z-score. The probability that the temperature is less than or equal to 15 degrees Celsius is approximately 0.6915 (or 69.15%).

Answer:

r^8

Step-by-step explanation:

r 2 • r • r 5

Assuming that r 2 means r^2

r ^2 • r • r^ 5

When the bases are the same and we are multiplying, we add the exponents

r ^2 • r^1 • r^ 5

r^(2+1+5)

r^(8)

Answer: [tex]r^8[/tex]

Step-by-step explanation:

You need to remember a property called "Product of powers property". This property states the following:

[tex](a^m)(a^n)=a^{(m+n)}[/tex]

You can observe that the bases of the expression [tex]r^2*r*r^5[/tex] are equal, then you can apply the property mentioned before.

Knowing this, you can make the multiplication indicated. Therefore, you get that the product is:

[tex]r^2*r*r^5=r^{(2+1+5)}=r^8[/tex]

Answer:

Overall Final Score = 83.7

Letter Grade = B

Step-by-step explanation:

To calculate weighted marks (grade), the rule is to multiply each weight  (in decimal) with respective marks and add them together. Let's do this:

Overall final score = (0.10*74) + (0.25*93) + (0.50*83) + (0.15*77) = 83.7

From the information given, we know that score between 80 and 90 is a "B".

Answer: 0.3085

Step-by-step explanation:

Given: Mean : [tex]\mu=300\text{ ml}[/tex]

Standard deviation : [tex]\sigma=10\text{ ml}[/tex]

The formula to calculate the value of z-score :-

[tex]z=\dfrac{X-\mu}{\sigma}[/tex]

For X = 295 ml, we have

[tex]z=\dfrac{295-300}{10}=-0.5[/tex]

The p-value of z = [tex]P(Z=z<-0.5)=0.3085[/tex]

Hence, the probability that the mean contents of the bottles in a six pack is less than 295 ml =0.3085

Answer:

13

Step-by-step explanation:

Let the two parts are x and y

as per the question

x+y=24   -----------------(A)

Also 7 times first part (x) that is 7x ,

when added to

5 times second part (y ) that is 5y

it gives 146

Hence our second equation becomes

7x+5y=146  ------------ (B)

Now we have to solve these two equations (A) and (B) to find the values of x and y

[tex]x+y=24 \\7x+5y=146\\[/tex]

now multiplying equation A with 5 and subtracting it from B

[tex]7x+5y=146[/tex]

[tex]-5x-5y=-120[/tex]

we get

2x=26

dividing both sides by 2 we get

x = 13

And hence our first part is 13

ANSWER

{y|y < -8 or y > 4}

EXPLANATION

The given absolute value equation is

[tex] |y + 2| \: > \: 6[/tex]

This implies that:

[tex](y + 2) \: > \: 6 \: or \: - (y + 2) \: > \: 6[/tex]

Multiply through by -1 in the second inequality and reverse the sign.

[tex]y + 2 \: > \: 6 \: or \: y + 2\: < \: - 6[/tex]

[tex]y \: > \: 6 - 2\: or \: y \: < \: - 6 - 2[/tex]

We simplify to get:

[tex]y \: > \: 4\: or \: y \: < \: - 8[/tex]

The correct answer is A.

Answer:

[tex]\large\boxed{\{y\ |\ y<-8\ or\ y>4\}}[/tex]

Step-by-step explanation:

[tex]|y+2|>6\iff y+2>6\ or\ y+2<-6\qquad\text{subtract 2 from both sides}\\\\y+2-2>6-2\ or\ y+2-2<-6-2\\\\y>4\ or\ y<-8\Rightarrow\{y\ |\ y<-8\ or\ y>4\}[/tex]

Answer:

  48°

Step-by-step explanation:

In triangle CYZ, angles Y and C are complementary, so ...

  (5x +22) + (12x) = 90

  17x +22 = 90

  17x = 68

  x = 4

The angle of interest is 12x° , so has measure

  12·4° = 48°

Answer:

m∠WZC=48°

Step-by-step explanation:

we know that

If ZC is an altitude

then

Triangle YZC is a right triangle

therefore

m∠CYW+m∠WZC=90° ----> by complementary angles

substitute

(5x+22)°+(12x)°=90°

17x=(90-22)°

x=4°

Find the measure of angle WZC

m∠WZC=(12x)°=12*4=48°

Answer: 0.0026

Step-by-step explanation:

Given: Mean : [tex]\mu=8.4\text{ hours}[/tex]

Standard Deviation : [tex]\sigma = 1.8\text{ hours}[/tex]

Sample size : [tex]n=40[/tex]

Formula to calculate z-score :-

[tex]z=\dfrac{X-\mu}{\dfrac{\sigma}{\sqrt{n}}}[/tex]

For X=7.6 hours.

[tex]z=\dfrac{7.6-8.4}{\dfrac{1.8}{\sqrt{40}}}=-2.81091347571\approx-2.8[/tex]

[tex]P(X<7.6)=P(Z<-2.8)=0.0025551\approx0.0026[/tex]

Hence, the probability that their mean rebuild time is less than 7.6 hours = 0.0026

The probability that their mean rebuild time is less than 7.6 hours is 0.0026

A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours. If 40 mechanics are randomly selected, find the probability that their mean rebuild time is less than 7.6 hours.

The Chevrolet Cavalier is the line of small cars produced for the model years 1982 until 2005 by Chevrolet. Mechanics is the physics area concerned with the motions of macroscopic objects. The mean is the number average. To calculate we add up all the numbers then divide by how many numbers there are. In other words it is the sum divided by the count.

[tex]\mu = 8.4 hours[/tex]

[tex]\sigma = 1.8 hours[/tex]

[tex]n=40[/tex]

[tex]z = \frac{Xbar -\mu}{\frac{\sigma}{\sqrt{r} } } = \frac{7.6-8.4}{\frac{1.8}{\sqrt{40} } } = -2.81[/tex]

Therefore the value of  Xbar < 7.6 hours. from the standard normal table is 0.0026

Hence, the probability that their mean rebuild time is less than 7.6 hours is  0.0026  = 0.26%.

Learn more about mean rebuild time https://brainly.com/question/13544358

#LearnWithBrainly

Answer with explanation:

Given : Sample mean =[tex]\overline{x}=\text{48.47 pounds}[/tex]

Standard deviation : [tex]\sigma=\text{ 3.1 pounds.}[/tex]

Sample size : n = 36

Claim : [tex]\mu\neq50[/tex]

∴ [tex]H_0:\mu=50[/tex]

[tex]H_1:\mu\neq50[/tex]

Since the alternative hypothesis is two tail , then the test is two tail test.

By using a z statistic and a 0.05 level of significance. Reject  [tex]H_0[/tex] if z < -1.960 or is z> 1.960.

Then , the test static for population mean is given by :-

[tex]z=\dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}[/tex]

[tex]z=\dfrac{48.47-50}{\dfrac{3.1}{\sqrt{36}}}\approx-2.96[/tex]

We reject [tex]H_0[/tex] since [tex]-2.96\leq -1.96[/tex]. We have statistically significant evidence at [tex]\alpha=0.05[/tex] to show that the mean amount of garbage per bin is not different from 50.  

To test if the mean amount of garbage per bin is different from 50, we set up null and alternative hypotheses and use a z-test to calculate a z-score. The z-score of -1.49 falls within the acceptance region; hence, we fail to reject the null hypothesis, implying that the mean amount of garbage per bin is not significantly different from 50 pounds.

First, we need to set up our null and alternative hypotheses. The null hypothesis (H0) states that the mean amount of garbage is 50, or μ = 50. The alternative hypothesis (H1) is that the mean is different from 50, or μ ≠ 50.

Second, calculate the z-score which is given by the formula Z = (X - μ) / (σ/√n), where X is the sample mean, μ is the population mean, σ is the standard deviation and n is the sample size. Substituting the given values, we get Z = (48.47 - 50) / (3.1 / √36) = -1.49

For a two-tailed test, we are checking if the z-score falls within the rejection region. Since our level of significance is 0.05, the critical values for a two-tailed test are -1.96 and 1.96. Our computed z-score of -1.49 falls within the acceptance region. Therefore, we fail to reject the null hypothesis. This suggests that the mean amount of garbage per bin is not statistically different from 50 pounds at the 0.05 level of significance.

https://brainly.com/question/34171008

#SPJ3

First convert the dimensions of the pyramid from feet to yards.

1 yard = 3 feet.

756 feet / 3 ft per yard = 252 yards.

480 feet / 3 ft per yard = 160 yards.

The formula for volume of a pyramid is:  Area of the base x the height divided by 3.

Volume = 252 yds^2 x 160/3 = 63504 x 160/3 = 3,386,880 cubic yards.

Now to find the number of bricks needed. divide the total volume by the volume of 1 brick:

3,386,880 / 1.5 = 2,257,920 total bricks.

Answer:

Equation of tangent is [tex]y-2\sqrt{3}x=2-2\frac{\pi}{\sqrt{3}}[/tex]

Step-by-step explanation:

Given:

Equation of curve, y = sec x

Passing through point = [tex](\frac{\pi}{3},2)[/tex]

We need to find Equation of tangent to the given curve and at the given point.

First we find the slope of the tangent by differentiating the given curve.

As we know that slope of the tangent, m = [tex]\frac{\mathrm{d}y}{\mathrm{d} x}[/tex]

So, consider

y = sec x

[tex]\frac{\mathrm{d}y}{\mathrm{d} x}=\frac{\mathrm{d}(sec\,x)}{\mathrm{d} x}[/tex]

[tex]\frac{\mathrm{d}y}{\mathrm{d} x}=sec\,x\:tan\,x[/tex]

Now we find value of slope at given point,

put x = [tex]\frac{\pi}{3}[/tex] in above derivate

we get

[tex]\frac{\mathrm{d}y}{\mathrm{d} x}=sec\,\frac{\pi}{3}\:tan\,{\pi}{3}=2\sqrt{3}[/tex]

Now using Slope point form, we have

Equation of tangent

[tex]y-y_1=m(x-x_1)[/tex]

[tex]y-2=2\sqrt{3}(x-\frac{\pi}{3})[/tex]

[tex]y=2\sqrt{3}x-2\sqrt{3}\frac{\pi}{3}+2[/tex]

[tex]y-2\sqrt{3}x=2-2\frac{\pi}{\sqrt{3}}[/tex]

Therefore, Equation of tangent is [tex]y-2\sqrt{3}x=2-2\frac{\pi}{\sqrt{3}}[/tex]

Answer:

543.7

Step-by-step explanation:

Answer:

543.7, 543.6, 543.7, 543.7, 543., 544.0

Step-by-step explanation:

Answer:

A

Step-by-step explanation:

Sum of the first n terms of a geometric series is:

S = a₁ (1 - r^n) / (1 - r)

Here, a₁ = 0.2, r = 6, and n = 5.

S = 0.2 (1 - 6^5) / (1 - 6)

S = 311

Answer:

Option A

Step-by-step explanation:

For the given geometric series  

a₁ = 0.2

a₅ = 259.2

r = 6

Then we have to find the sum of initial 5 terms of this series

[tex]S_{n} =\frac{a_1(r^4-1)}{(r-1)}=\frac{0.2(6^3-1)}{(6-1)}[/tex]

[tex]=\frac{0.2(7776-1)}{5}[/tex]

[tex]\frac{0.2\times 7775}{5}[/tex]

= 311

Option A is the answer.

Answer:

(3;4); (-3;-4); (3;-4); (-3;4)

Step-by-step explanation:

for more information see the attached picture.

Answer:  The required solution set is

(x, y) = (3, 4), (-3, 4), (3, -4) and (-3, -4).

Step-by-step explanation:  We are given to solve the following system :

[tex]x^2+y^2=25~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)\\\\y^2-x^2=7~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(ii)[/tex]

We will be using the method of Elimination to solve the problem.

Adding equations (i) and (ii), we have

[tex](x^2+y^2)+(y^2-x^2)=25+7\\\\\Rightarrow 2y^2=32\\\\\Rightarrow y^2=16\\\\\Rightarrow y=\pm\sqrt{16}~~~~~~~~~~~~~~~~~~~[\textup{taking square root on both sides}]\\\\\Rightarrow y=\pm4.[/tex]

From equation (ii), we get

[tex](\pm4)^2-x^2=7\\\\\Rightarrow 16-x^2=7\\\\\Rightarrow x^2=16-7\\\\\Rightarrow x^2=9\\\\\Rightarrow x=\pm\sqrt9~~~~~~~~~~~~~~~~~~[\textup{taking square root on both sides}]\\\\\Rightarrow x=\pm3.[/tex]

Thus, the required solution set is

(x, y) = (3, 4), (-3, 4), (3, -4) and (-3, -4).

For this case we must factor the following expression:

[tex]x ^ 3-y ^ 3[/tex]

We have that since both terms are perfect cubes, we factor using the cube difference formula.

[tex]a ^ 3-b ^ 3 = (a-b) (a ^ 2 + ab + b ^ 2)[/tex]

Where:

[tex]a = x\\b = y[/tex]

So, we have to:

[tex]x ^ 3-y ^ 3 = (x-y) (x ^ 2 + xy + y ^ 2)[/tex]

Answer:

[tex]x ^ 3-y ^ 3 = (x-y) (x ^ 2 + xy + y ^ 2)[/tex]

Answer:

Neither a relation or a function

Answer: B. Both a relation and a function

Step-by-step explanation:

By definition, a relation is a function if and only if each input value has one and only one output value.

For example if an input value [tex]x[/tex] has assigned two or more output values [tex]y_1[/tex] and [tex]y_2[/tex], then the relation is not a function.

You can observe in the image attached that each element in the Domain has assigned one element in the Range. Therefore, you can conclude that it is a relation and a function.

Answer: 70°

Step-by-step explanation:

ΔVWX ≅ ΔNOP     ⇒    ∠V=∠N, ∠W=∠O, and ∠X=∠P

Since ∠V=44° and ∠P=66°=∠X

then we can use the Triangle Sum Theorem:

∠V + ∠W + ∠X = 180°

44° + ∠W + 66° = 180°

        ∠W + 110° = 180°

        ∠W           = 70°

Try this option:

the functions y=sin(x) and y=cos(x) are the standart functions; it means, the period of each is 2π, maximum value is '1', minimum value is '-1'.

Using the properties described above, to find the max. value for the function y=2cos(x): 2*1=2, where 2- the amplitude of the given function, 1- maximum of the standart function;

the max. value for the function y=3sin(x+π): 3*1=3, where 3 - the amplitude of the given function, 1- maximum of the standart function.

For more details see the attached picture.

In other words, common equation for such functions is y=A*sin(ωx+Ф), where A- amplitude, ω - frequency and Ф - initial phase of the given function.

Max. and min. values depend on A, all the points of the function repeat every 2π, including max. and min. values.

[tex]f(x)=2\cos x[/tex]

We know that the function f(x) is a cosine function and the maximum value is obtained by the function when this cosine function takes the maximum value.

We know that:

[tex]-1\leq \cos x\leq 1[/tex]

This means that the cosine function  takes the maximum values as: 1

and when [tex]\cos x=1[/tex] then

[tex]f(x)=2\times 1\\\\i.e.\\\\f(x)=2[/tex]

i.e. Maximum value of function f(x)=2

[tex]g(x)=3\sin (x+\pi)[/tex]

Again the function g(x) will attain the maximum value when the function sine will takes the maximum value.

We know that the range of the sine function is: [-1,1]

This means that the maximum value of sine function is: 1

Hence, when [tex]\sin (x+\pi)=1[/tex] then,

[tex]g(x)=3\times 1\\\\i.e.\\\\g(x)=3[/tex]

i.e. Maximum value of function g(x)=3

          The function g(x) has the largest maximum value.

                            ( Since 3>2)

Answer:

56.25%

Step-by-step explanation:

If 14 are male, that means that 32 - 14 = 18 are female.  If 18/32 are female, do the division and then multiply by 100 to get the percentage.

18/32 = .5625

.5625 × 100% = 56.25%