Can somebody please help me with problem A and B

Answer:

D. 272 poles

Explanation:

We are given that:

The top layer has 20 poles, the next down one has 24 poles and the third one has 28 poles

We can note that each layer has 4 poles more that the one above it

Based on this, we can get the number of poles in each layer as follows:

Top layer has 20 poles

Second one has 20 + 4 = 24 poles

Third one has 24 + 4 = 28 poles

Fourth one has 28 + 4 = 32 poles

Fifth one has 32 + 4 = 36 poles

Sixth one has 36 + 4 = 40 poles

Seventh one has 40 + 4 = 44 poles

Eighth one has 44 + 4 = 48 poles

Now, we can get the total number of poles by adding the poles in all layers

This is done as follows:

Total number of poles = 20 + 24 + 28 + 32 + 36 + 40 + 44 + 48

Total number of poles = 272 poles

Hope this helps :)

Answer: Third option.

Step-by-step explanation:

You need to find the surface area with the formula for calculate the surface area of a rectangular prism:

[tex]SA=2(wl + lh + hw)[/tex]

Where w is the width, l is the length, and h is the height.

You can observe in the figure that:

[tex]l=5cm\\w=4cm\\h=2cm[/tex]

Then, substituting the values into the formula  [tex]SA=2(wl + lh + hw)[/tex], you get that  minimum amount of cardboard used for the wrapper is:

[tex]SA=2[(4cm)(5cm)+(5cm)(2cm)+(2cm)(4cm)]\\SA=76cm^2[/tex]

Answer:

third option

Step-by-step explanation:

Answer:

1.)[tex]-12+4x=-12+4x[/tex]

2.) [tex]2-2x \neq -8-2x[/tex]

Step-by-step explanation:

The distributive property states that multiplying a sum by a number gives the same result as multiplying each addend by the number and then adding all the products.

[tex]a(b+c)=ab+ac[/tex]

For the first equation

[tex]-2(6-2x)=4(-3+x)\\(-2)(6)+(-2)(-2x)=(4)(-3)+(4)(x)\\-12+4x=-12+4x[/tex]

For the second equation

[tex]5-1(2x+3)=-2(4+x)\\5+((-1)(2x)+(-1)(3))= (-2)(4)+(-2)(x)\\5+(-2x-3) = -8+(-2x)\\5-2x-3=-8-2x\\2-2x \neq -8-2x[/tex]

.

Answer:

y = 3 • ± √2 = ± 4.2426

Step-by-step explanation:

2y2 -  36  = 0  

Step  2  :

Step  3  :

Pulling out like terms :

3.1     Pull out like factors :

  2y2 - 36  =   2 • (y2 - 18)  

Trying to factor as a Difference of Squares :

3.2      Factoring:  y2 - 18  

Theory : A difference of two perfect squares,  A2 - B2  can be factored into  (A+B) • (A-B)

Proof :  (A+B) • (A-B) =

        A2 - AB + BA - B2 =

        A2 - AB + AB - B2 =  

        A2 - B2

Note :  AB = BA is the commutative property of multiplication.  

Note :  - AB + AB equals zero and is therefore eliminated from the expression.

Check : 18 is not a square !!  

Ruling : Binomial can not be factored as the difference of two perfect squares.

Equation at the end of step  3  :

 2 • (y2 - 18)  = 0  

Step  4  :

Equations which are never true :

4.1      Solve :    2   =  0

This equation has no solution.

A a non-zero constant never equals zero.

Solving a Single Variable Equation :

4.2      Solve  :    y2-18 = 0  

Add  18  to both sides of the equation :  

                     y2 = 18  

When two things are equal, their square roots are equal. Taking the square root of the two sides of the equation we get:  

                     y  =  ± √ 18  

Can  √ 18 be simplified ?

Yes!   The prime factorization of  18   is

  2•3•3  

To be able to remove something from under the radical, there have to be  2  instances of it (because we are taking a square i.e. second root).

√ 18   =  √ 2•3•3   =

               ±  3 • √ 2  

The equation has two real solutions  

These solutions are  y = 3 • ± √2 = ± 4.2426

Answer:

It has no special appearance.

Step-by-step explanation:

Any angle of measure 180° or less is supplementary to some angle. A supplementary angle is one that is the difference between 180° and the angle you have. That is, two supplementary angles total 180°.

__

Supplementary angles are readily identifiable in a number of geometries. Adjacent angles of a parallelogram are supplementary; linear angles are supplementary. Same-side interior angles where a transversal crosses parallel lines are supplementary.

Let [tex]x[/tex] be the amount (mL) of the pure vinegar the chef will use, and [tex]y[/tex] the amount of dressing. She wants to end up with a 310 mL mixture, so

[tex]x+y=310[/tex]

For each mL used of the dressing, 0.07 mL is vinegar, and the chef wants to end up with a 19% vinegar mixture, so

[tex]x+0.07y=0.19(x+y)=58.9[/tex]

Now

[tex]x+y=310\implies y=310-x[/tex]

[tex]\implies x+0.07(310-x)=58.9[/tex]

[tex]\implies0.93x+21.7=58.9[/tex]

[tex]\implies0.93x=37.2[/tex]

[tex]\implies x=40[/tex]

[tex]\implies y=270[/tex]

Answer:

Sometimes you to plot some points to get a good approximation of the location of extreme values.

Approximating some points, especially influential points or outliers, helps to get a better grasp of the location of the extreme values. This is crucial in fields like calculus, statistics and graphing, and it assists in identifying patterns and trends. Additionally, substitution of 'x' values in an equation can help estimate 'y' values.

Sometimes in mathematics, particularly in fields such as calculus, statistics, and graph theory, you need to approximate some points for a good understanding of the location of extreme values. This practice is especially useful when identifying influential points or outliers within a data set, as these points significantly alter the slope or fitness of a regression line. When you find such points, you can exclude them from your calculations to get a more accurate overview of the general pattern or trend.

In the case of graphing, selection of an appropriate scale for both axes is also crucial. The scale should reflect all your data while also making it easy to identify any trends within it. Too large a scale can make data changes hard to see, while a too fine scale necessitates more space for the graph and can crowd information.

Additionally, in calculus and algebra, to estimate the 'y' values for various 'x-values', one can substitute the 'x' values into the equation. This helps to offer a clearer insight into the correlation of variables within a function.

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Final answer:

The surveying method that is most likely to produce a representative sample of the yogurt shop's customers is true random sampling.

Explanation:

The surveying method that is most likely to produce a representative sample of the yogurt shop's customers is the true random sampling method. This method involves randomly selecting participants from the entire population of yogurt shop customers, ensuring that each customer has an equal chance of being selected. This helps to minimize bias and ensure that the sample is representative of the entire customer population.

For example, the manager can generate a list of all the customers who have made purchases at the yogurt shop over a specific period of time, and then use a random number generator or a random selection method to choose a certain number of customers from the list. This will ensure that the selected participants represent the diversity of the yogurt shop's customer base.

The most appropriate surveying method for the yogurt shop manager to obtain a representative sample of customers is systematic sampling.

To obtain a representative sample of the yogurt shop's customers, the most appropriate surveying method would be a systematic sampling approach. This involves selecting every nth customer who visits the shop during different times of the day and different days of the week.

By using a systematic sampling method, the manager can ensure that the sample includes customers from various demographic groups, such as different age ranges, genders, and visiting patterns. This approach reduces the potential for bias that may arise from convenience sampling methods, where only customers who are readily available or willing to participate are surveyed.

Additionally, the systematic sampling method allows the manager to capture the preferences of both regular and occasional customers, as well as those who visit during peak and off-peak hours. This comprehensive representation of the customer base increases the likelihood that the survey results will accurately reflect the preferences of the yogurt shop's overall customer population.

Systematic sampling is more time-consuming and resource-intensive than convenience sampling, but it is a more reliable method for obtaining a representative sample of the yogurt shop's customers, which is crucial for making informed decisions about introducing new flavors that will appeal to a wide range of customers.

Answer:

  see below

Step-by-step explanation:

Since there are fewer sequences than functions, we'll identify the matchup according to the sequence.

11, 33, 55, 77, ...

The first term is 11. The terms have a common difference of 33 -11 = 22. That is, each term is 22 more than the previous one. The appropriate recursive function is ...

__

-18, -108, -648, -3888, ...

The first term is -18. The terms obviously do not have a common difference, but their common ratio is -648/-108 = -108/-18 = 6. That is, each term is 6 times the previous one. Then the appropriate recursive function is ...

__

-18, 3, 24, 45, ...

The first term is -18. The terms have a common difference of 3-(-18) = 21. That is, each term is 21 more than the previous one. The appropriate recursive function is ...

Answer:

11, 33, 55, 77, ...=f(n) = f(n - 1) + 22 for n = 2, 3, 4, ...

-18, -108, -648, -3,888, ...=f(n) = 6 · f(n - 1) for n = 2, 3, 4, ...

-18, 3, 24, 45, ...=f(n) = f(n - 1) + 21 for n = 2, 3, 4, ...

Step-by-step explanation:

Answer:

It is c = kt.

Step-by-step explanation:

This is direct variation . As the time increases the number of cranes increases.

The equation is c = kt  where k is the constant  of variation.  In this case it will be a positive value because c is increasing with time.

If they make 20 cranes in 10 minutes then we can find the value of k by plugging in these values;

20 = k * 10

g = 20/10

k = 2.

So they make 2 cranes per minute.

Answer:

[tex]\displaystyle x=\frac{-8\pm\sqrt{(8)^2-4(4)(-221)}}{2(4)}\ \text{; x = 6.5 and x = -8.5}[/tex]

Step-by-step explanation:

Subtract the right side of the given equation to put it into standard form:

  4x² +8x -221 = 0

Then the coefficients used in the quadratic formula are ...

When these are filled into the form ...

[tex]\displaystyle x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}[/tex]

the result is as shown above.

Answer:

7/50

Step-by-step explanation:

Experimental and theoretical probability are much different.

With experimental, just read the experiment: the number two was rolled 7 times.

Put that over 50.

Avoid questions with theoretical probability, that's where math comes in.

Final answer:

The experimental probability of rolling a two on a number cube that was rolled 50 times and showed the number two 7 times is 0.14 or 14%.

Explanation:

To calculate the experimental probability of the number cube showing the number two, we divide the number of times two appears by the total number of rolls. In this case, the number cube was rolled 50 times and the number two appeared 7 times. Therefore, the experimental probability, denoted as P(2), is calculated as:

P(2) = Number of times two appears / Total number of rolls

P(2) = 7 / 50

P(2) = 0.14

So, the experimental probability of rolling a two on this number cube, based on the given data, is 0.14 or 14%.

Answer:

  A)  (20, 0)

Step-by-step explanation:

Double the second equation and add that to the first:

  (0.2x +0.5y) +2(-0.1x +0.3y) = (4) +2(-2)

  1.1y = 0

   y = 0

Substitute this value into either equation to find x.

  0.2x +0.5·0 = 4

  x = 4/0.2 = 20

The solution is (x, y) = (20, 0).

Answer:

It's choice 2.

Step-by-step explanation:

y=19.485x+86.912

The 19.485 is the slope of the graph of this equation.  This gives the rate of change of the amount of the bill (above $86.912)  for  each added resident (x).

Answer:

The average rate of change is : [tex]6.3[/tex]

Step-by-step explanation:

The number of car owners is modeled by the function;

[tex]f(t)=1.1t^2-2.5t+1.5[/tex], where t is the different number of years.

The average rate of change  of f(t)  from t=3 to t=5 is simply the slope of the secant line connecting:

(3, f(3)) and (5,f(5))

Which is given by:

[tex]\frac{f(5)-f(3)}{5-3}[/tex]

Now, we substitute t=3 into the function to get;

[tex]f(3)=1.1(3)^2-2.5(3)+1.5[/tex]

[tex]f(3)=3.9[/tex]

We substitute t=5 into the function to get;

[tex]f(5)=1.1(5)^2-2.5(5)+1.5[/tex]

[tex]f(5)=16.5[/tex]

Therefore the average rate of change is : [tex]\frac{14.5-3.9}{2}=6.3[/tex]

Answer:

8/5

Step-by-step explanation:

The slope of two parallel lines is always the same, just are in different locations on the x or y axis.

The value 1.8 represents the growth factor in the expression, indicating the monthly growth rate of club members after advertising.

The value 1.8 in the given expression that models the number of club members, in hundreds, after advertising for t months represents the growth factor, which is the rate at which the total number of members at the club increases each month. This is not the initial number of members, nor the monthly percentage increase, nor the number of new members joining per month, but rather the multiplier applied to the previous month's total to find the next month's projected total.

To find the tension in each cable, we need to consider the forces acting on the weight. Using Newton's second law and trigonometry, we can set up equations to solve for the tension in each cable. The tension in each cable is (OPTION C) 50 lb.

To find the tension in each cable, we need to consider the forces acting on the weight. In this case, there are two cables pulling upward and the weight pulling downward. Since the weight is in equilibrium, the sum of the upward forces must equal the downward force. Let's label the tension in the first cable as T1 and the tension in the second cable as T2.

Using Newton's second law, we can set up the following equation: T1 + T2 = 100 lb. We also know that the angle between each cable and the vertical is the same, so the horizontal components of tension in both cables are equal. Let's call this component T.

Since the weight is in equilibrium, the vertical components of tension in the cables must also balance the weight's weight. The vertical component of tension in each cable can be found using trigonometry. Let's call this component V.

Now, we can set up two equations for the horizontal and vertical components:

T + T = 100 lb (Equation 1)

V + V = weight of the weight = 100 lb (Equation 2)

Since T1 + T2 = 2T, Equation 1 becomes:

2T = 100 lb

T = 50 lb

Substituting T = 50 lb into Equation 2, we can find V:

2V = 100 lb

V = 50 lb

Therefore, the tension in each cable is 50 lb.

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Answer:

5 liters

Step-by-step explanation:

Divide 35 liters evenly between the 7 pitchers and you'll have 5 liters in each pitcher.

To find the amount of lemonade in each pitcher, divide the total amount of lemonade by the number of pitchers. In this case, each pitcher will contain 5 liters of lemonade.

To find the amount of lemonade in each pitcher, we divide the total amount of lemonade by the number of pitchers. In this case, Bob has 35 liters of lemonade and 7 pitchers. So, to find the amount of lemonade in each pitcher, we divide 35 by 7.

35 ÷ 7 = 5 liters of lemonade

Therefore, there will be 5 liters of lemonade in each pitcher.

If Bob has 35 liters of lemonade and he distributes it equally into 7 juice pitchers, we need to perform a division to find out how much lemonade will be in each pitcher. The calculation is straightforward:

Divide the total volume of lemonade by the number of pitchers.

35 liters ÷ 7 pitchers = 5 liters per pitcher.

Therefore, each juice pitcher will contain 5 liters of lemonade.

Answer:

2u + v - 4w = <40 , -4>

6u - 8v = <-78 , 58>

4v - 7w = <101 , -36>

11u + 3w = <-88 , 89>

Step-by-step explanation:

* Lets find the value of each operation to find its resultant vector

# 2u + v - 4w

∵ u = <-5 , 7>

∴ 2u = <-10 , 14>

∵ v = <6 , -2>

∵ w = <-11 , 4>

∴ 4w = <-44 , 16>

∴ 2u + v - 4w = <-10 + 6 - -44 , 14 + -2 - 16>

∴ 2u + v - 4w = <40 , -4>

# 6u - 8v

∵ u = <-5 , 7>

∴ 6u = <-30 , 42>

∵ v = <6 , -2>

∵8v = <48 , -16>

∴ 6u - 8v = <-30 - 48 , 42 - -16>

∴ 6u - 8v = <-78 , 58>

# 4v - 7w

∵ v = <6 , -2>

∴ 4v = <24 , -8>

∵ w = <-11 , 4>

∴ 7w = <-77 , 28>

∴ 4v - 7w = <24 - -77 , -8 - 28>

∴ 4v - 7w = <101 , -36>

# 11u + 3w

∵ u = <-5 , 7>

∴ 11u = <-55 , 77>

∵ w = <-11 , 4>

∴ 3w = <-33 , 12>

∴ 11u + 3w = <-55 + -33 , 77 + 12>

∴ 11u + 3w = <-88 , 89>

The owner wants people to believe that dance classes are popular so that they sign up for classes. Therefore, option C is the correct answer.

Probability can be defined as the ratio of the number of favourable outcomes to the total number of outcomes of an event.

The most likely reason the owner of the dance studio chain releases the report is to demonstrate the success of their business. By highlighting the fact that participation in dance classes has increased by 5% in each of the past three years, the owner is showing the public that the business is doing well and that they are providing a valuable service. This report may also be used to encourage potential customers to join the studio's classes, which would further increase their profits.

Therefore, option C is the correct answer.

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Answer:

9 / 20

Step-by-step explanation:

We can form a ratio with the information "for every 25 ml of orange juice you need 30 ml of apple juice and 45 ml of coconut milk"

25 : 30 : 45

Total = 100

Coconut milk = 45 ml

45 / 100 = 9 / 20

Answer:

60

Step-by-step explanation:

Angles AKB and EKD are vertical angles and congruent.

The measure of angle AKB is the sum of the measures of arcs AB and ED divided by 2.

m<AKB = (110 + 130)/2 = 120

Angles AKB and AKE are supplementary angles, so their measures add to 180 deg.

m<AKE + m<AKB = 180

m<AKE + 120 = 180

m<AKE = 60

the answer is 10. just use the distance formula which is the square root of (x2-x1)^2+(y2-y1)^2

Answer: 10 units

Step-by-step explanation:

The distance  from point (a,b) and (c,d) is given by formula below:-

[tex]D=\sqrt{(c-a)^2+(d-b)^2}[/tex]

Therefore, the distance between the points (5, 1) and (-3, -5) will be :

[tex]D=\sqrt{(-3-5)^2+(-5-1)^2}\\\\\Rightarrow\ D=\sqrt{(-8)^2+(-6)^2}\\\\\Rightarrow\ D=\sqrt{64+36}\\\\\Rightarrow\ D\sqrt{100}\\\\\Rightarrow\ D=10\text{ units}[/tex]

Hence, the distance between the points (5, 1) and (-3, -5) = 10 units

Answer:

$9.50 - for adults

$7.50 - children

Step-by-step explanation:

All you have to do is multiply $4.75 by 2 since there are two adults and multiply $2.50 by 3 since there  are three children.

Answer:

Step-by-step explanation:

When there are many instances of the same calculation, it is convenient to let a spreadsheet or graphing calculator do them. The formula can be entered once and used many times. See the attachment for an example.

1. The surface area of a box with dimensions L, W, D can be written as ...

  S = 2(LW +LD +WD) = 2(LW +D(L+W))

Then the surface area of the left (original) box is ...

  S = 2(2·12 + 8(2+12)) = 2(24 +112) = 272 . . . . square inches

The surface area of the right (proposed) box is ...

  S = 2(4·3 +14(4+3)) = 2(12 +98) = 220 . . . . square inches

The volume of the original box, at 2·12·8 = 192 in³ is greater than the volume of the proposed box (3·4·14 = 168 in³), so the customer gets less cereal with the redesigned box. I don't dig it.

__

2. The previous question shows the formula and an example of the calculation. The attachment shows the numbers for this question.

__

3. The attachment shows the numbers for this question.

Answer:

15 seconds

Step-by-step explanation:

If you make a table of values for the dog and the squirrel using d = rt, then the rates are easy:  the dog's rate is 150 and the squirrel's is 100.  The t is what we are looking for, so that's our unknown, and the distance is a bit tricky, but let's look at what we know:  the dog is 200 feet behind the squirrel, so when the dog catches up to the squirrel, he has run some distance d plus the 200 feet to catch up.  Since we don't know what d is, we will just call it d!  Now it seems as though we have 2 unknowns which is a problem.  However, if we solve both equations (the one for the dog and the one for the squirrel) for t, we can set them equal to each other.  Here's the dog's equation:

d = rt

d+200 = 150t

And the squirrel's:

d = 100t

If we solve both for t and set them equal to each other we have:

[tex]\frac{150}{d+200} =\frac{100}{d}[/tex]

Now we can cross multiply to solve for d:

150d = 100d + 20,000 and

50d = 20,000

d = 400

But we're not looking for the distance the squirrel traveled before the dog caught it, we are looking for how long it took.  So sub that d value back into one of the equations we have solved for t and do the math:

[tex]t=\frac{100}{d}=\frac{100}{400} =\frac{1}{4}[/tex]

That's 1/4 of a minute which is 15 seconds.

Answer:

4 mins

Step-by-step explanation:

Let x = the distance the squirrel runs before it's caught,

then the dog runs 200 + x.

distance/rate = time

x/100 = (200+x)/150 =>x/2 = (200+x)/3 => 400 +2x = 3x => x = 400

The squirrel runs 400' in 4 minutes.

The angle of elevation from Jonathan to Mina is approximately 43.81 degrees.

If you know the lengths of two sides of a right triangle, you can use trigonometric ratios to calculate the measures of one (or both) of the acute angles.

Here,
We can use the tangent function to find the angle of elevation from Jonathan to Mina.

Let θ be the angle of elevation, then we have:

tan(θ) = opposite / adjacent

Where the opposite is the height of the tower (389 feet) and adjacent is the distance between Jonathan and the base of the tower (412 feet).

So, we have:

tan(θ) = 389 / 412

θ ≈ 43.81 degrees

Therefore, the angle of elevation from Jonathan to Mina is approximately 43.81 degrees.

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I'll match them for you, but to find the inverse of an equation, all you must do is

[tex]f(x)^{-1}  = 5x[/tex]  →  [tex]f(x) = \frac{x}{5}[/tex]

[tex]f(x)^{-1} = \frac{x^{3}}{2}[/tex]  →  [tex]f(x) = \sqrt[3]{2x}[/tex]

[tex]f(x)^{-1} = x + 10[/tex]  →  [tex]f(x) = x - 10[/tex]

[tex]f(x)^{-1} = \frac{3(x+17)}{2}[/tex]  →  [tex]f(x) = \frac{2x}{3} -17[/tex]

Hope I help ! :)

ANSWER

[tex] \boxed {f(x)= \frac{2x}{3} - 17\to \: f ^{ - 1} (x)=\frac{3x + 51}{2}}[/tex]

[tex] \boxed {f(x) = x - 10 \to {f}^{ - 1} (x) = x + 10 }[/tex]

[tex] \boxed {f(x) = \sqrt[3]{2x} \to {f}^{ - 1} (x) = \frac{ {x}^{3} }{2} }[/tex]

[tex] \boxed {f(x) = \frac{x}{5} \to{f}^{ - 1} (x) = 5x}[/tex]

EXPLANATION

1.

Given :

[tex]f(x) = \frac{2x}{3} - 17[/tex]

Let

[tex]y =\frac{2x}{3} - 17[/tex]

Interchange x and y.

[tex]x=\frac{2y}{3} - 17[/tex]

Solve for y.

[tex]x + 17=\frac{2y}{3} [/tex]

[tex]3x + 51=2y[/tex]

[tex]y=\frac{3x + 51}{2} [/tex]

[tex]f ^{ - 1} (x)=\frac{3x + 51}{2} [/tex]

2.

Given: f(x)=x-10

Let y=x-10

Interchange x and y.

x=y-10

Solve for y.

y=x+10

This implies that,

[tex] {f}^{ - 1} (x) = x + 10[/tex]

3.

Given:

[tex]f(x) = \sqrt[3]{2x} [/tex]

Let

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

Interchange x and y.

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

solve for y.

[tex] {x}^{3} = 2y[/tex]

[tex]y = \frac{ {x}^{3} }{2} [/tex]

[tex] {f}^{ - 1} (x) = \frac{ {x}^{3} }{2} [/tex]

4.

Given:

[tex]f(x) = \frac{x}{5} [/tex]

Let

[tex]y = \frac{x}{5} [/tex]

Interchange x and y.

[tex]x = \frac{y}{5} [/tex]

Solve for y.

[tex]y = 5x[/tex]

[tex] {f}^{ - 1} (x) = 5x[/tex]

Answer:

Surface area increases by a factor of 4

Step-by-step explanation:

Given the linear ratio = a : b, then

the area ratio = a² : b²

Here the linear ratio = 1 : 2, hence

area ratio = 1² : 2² = 1 : 4 ← increase by factor of 4