URGENT PLEASE HELP 98 POINTS Find the direction angle of vector v to the nearest tenth of a degree.

Answer:

It's the first choice.

Step-by-step explanation:

cos θ  = √(1 - sin^2 θ ) and cos θ  will be positive because  sin θ > 0  tan θ > 0. The angle  θ  will be in the first quadrant.

cos  θ  = √( 1 - (2/7)^2)

cos  θ = √(1 - 4/49) = √(45/49)

cos  θ  = √9√5 / 7

cos  θ  = 3√5 / 7.

Answer:

3 square root of 5 over 7. it's positive answer because both sin and tan are positive meaning they are sitting in the first quadrant were all ∅'s are positive

Step-by-step explanation:

You can analyze it in this way:

1)(2) in y2-2y can show that was (y-1)^2 so we add -1 to -8 => -9

2)(8) in x2-8x show us that was (x-4)^2 so we add -16 to -9 => -25

and finally we have:(x-4)^2 + (y-1)^2 =25

it means C is true!

Answer:(x−4)2+(y−1)2=25 is the answer

A triangle is 180°. So you can do:

3.2n + 6.4n + 2.4n = 180   Simplify

12n = 180

n = 15   Now that you know the value of n, you can plug it into each individual angle/equation

∠X = 3.2n    plug in 15 for n

∠X = 3.2(15)

∠X = 48°

∠Y = 6.4(15)

∠Y = 96°

∠Z = 2.4(15)

∠Z = 36°

Answer:

[tex]t=5\ sec[/tex]

Step-by-step explanation:

we have

[tex]-t^{2} +4t+5=0[/tex]

Solve the quadratic equation to find the zero's or x-intercepts

Remember that

The x-intercepts are the values of x when the value of y is equal to zero ( water balloon reach the ground)

we know that

The formula to solve a quadratic equation of the form [tex]ax^{2} +bx+c=0[/tex] is equal to

[tex]x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}[/tex]

in this problem we have

[tex]-t^{2} +4t+5=0[/tex]

so

[tex]a=-1\\b=4\\c=5[/tex]

substitute in the formula

[tex]t=\frac{-4(+/-)\sqrt{4^{2}-4(-1)(5)}} {2(-1)}[/tex]

[tex]t=\frac{-4(+/-)\sqrt{36}} {-2}[/tex]

[tex]t=\frac{-4(+/-)6} {-2}[/tex]

[tex]t=\frac{-4(+)6} {-2}=-1[/tex]

[tex]t=\frac{-4(-)6} {-2}=5[/tex]

therefore

the solution is [tex]t=5\ sec[/tex]

Answer:

5 seconds

Step-by-step explanation:

ttm/imagine math

Answer:

[tex]x^2+y^2-8x-4y+11=0[/tex]

Step-by-step explanation:

We want to find the equation of the circle: [tex](x-4)^2+(y-2)^2=9[/tex] in general form.

We need to expand the parenthesis to obtain: [tex]x^2-8x+16+y^2-4y+4=9[/tex]

This implies that:

[tex]x^2+y^2-8x-4y+20=9[/tex]

We add -9 to both sides of the equattion to get:

[tex]x^2+y^2-8x-4y+20-9=0[/tex]

Simplify the constant terms to get:

[tex]x^2+y^2-8x-4y+11=0[/tex]

The general form of the equation is x^2 + y^2 - 8x -4y - 11 = 0

The equation is given as:

(x-4)^2+(y-2)^2=9

Evaluate the exponents

x^2 - 8x + 16 + y^2 -4y + 4 = 9

Collect like terms

x^2 - 8x +  y^2 -4y - 9 + 16 + 4 = 0

Evaluate the like terms

x^2 - 8x +  y^2 -4y - 11 = 0

Rewrite as:

x^2 + y^2 - 8x -4y - 11 = 0

Hence, the general form of the equation is x^2 + y^2 - 8x -4y - 11 = 0

Read more about circle equations at:

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Answer:

A, g(x) = 7x + 5

Step-by-step explanation:

applying these translations to the parent function f(x) = x, we would get the following equation:

g(x) = 7x + 5

a vertical compression is written before the parent function (in this case f(x)=x), and a shift up is written next to the function. both of these are without parentheses

the answer would be A, g(x) = 7x + 5

Answer:

  (1/4, ln(1/2))

Step-by-step explanation:

The slope of the given line is -1/4, so the perpendicular line will have a slope of -1/(-1/4) = 4.

The slope of the given function is its derivative:

  y' = 2/(2x) = 1/x

That will have a value of 4 when x = 1/4.

The point on the graph where the slope is 4 is (x, y) = (1/4, ln(1/2)).

Answer:

[tex](\frac{1}{4},-\ln(2))[/tex]

Step-by-step explanation:

Let's first differentiate [tex]y=\ln(2x)[/tex].

This gives us [tex]y'=\frac{(2x)'}{2x}=\frac{2}{2x}=\frac{1}{x}[/tex].  This gives us the slope of any tangent line to any point on the curve of [tex]y=\ln(2x)[/tex].

Let [tex](a,b)[/tex] be a point on [tex]y=\ln(2x)[/tex] such that the tangent line at that point is perpendicular to [tex]x+4y=1[/tex].

Let's find the slope of this perpendicular line so we can determine the slope of the tangent line. Keep in mind, that perpendicular lines (if not horizontal to vertical lines or vice versa) have opposite reciprocal slopes.

Let's begin.

[tex]x+4y=1[/tex]

Subtract [tex]x[/tex] on both sides:

[tex]4y=-x+1[/tex]

Divide both sides by 4:

[tex]y=\frac{-x}{4}+\frac{1}{4}[/tex]

The slope is -1/4.

This means the line perpendicular to it, the slope of the line we wish to find, is 4.

So we want the following to be true:

[tex]\frac{1}{x} \text{ at } x=a[/tex] to be [tex]4[/tex].

So we are going to solve the following equation:

[tex]\frac{1}{a}=4[/tex]

Multiply both sides by [tex]a[/tex]:

[tex]1=4a[/tex]

Divide both sides by 4:

[tex]\frac{1}{4}=a[/tex]

So now let's find the corresponding [tex]y[/tex]-coordinate that I called [tex]b[/tex] earlier for our particular point that we wished to find.

[tex]y=\ln(2x)[/tex] for [tex]x=a=\frac{1}{4}[/tex]:

[tex]y=\ln(2\cdot \frac{1}{4})[/tex] (this is our [tex]b[/tex])

[tex]y=\ln(\frac{1}{2})[/tex]

[tex]y=\ln(1)-\ln(2)[/tex]

[tex]y=0-\ln(2)[/tex]

[tex]y=-\ln(2)[/tex]

So the point that we wished to find is [tex](\frac{1}{4},-\ln(2))[/tex].

---------------------Verify--------------------------------

What is the line perpendicular to the tangent line to the curve [tex]y=\ln(2x)[/tex] at [tex](\frac{1}{4},-\ln(2))[/tex]?

Let's find the slope formula for our tangent lines to this curve:

[tex]y'=\frac{1}{x}[/tex]

[tex]y'=\frac{1}{x}[/tex] evaluated at [tex]x=\frac{1}{4}[/tex]:

[tex]y'=\frac{1}{\frac{1}{4}}=4[/tex]

This says the slope of this tangent line is 4.

A line perpendicular this will have slope -1/4.

So we know our line will be of the form:

[tex]y=\frac{-1}{4}x+c[/tex]

Multiply both sides by 4:

[tex]4y=-1x+4c[/tex]

Add [tex]1x[/tex] on both sides:

[tex]4y+1x=4c[/tex]

Reorder using commutative property:

[tex]1x+4y=4c[/tex]

Use multiplicative identity property:

[tex]x+4y=4c[/tex]

As we see the line is in this form. We didn't need to know about the [tex]y[/tex]-intercept,[tex]c[/tex], of this equation.

Answer:

15.8 to nearest tenth.

Step-by-step explanation:

Using the distance formula to find the lengths of the 3 sides:

AC = √ [(5-0)^2 + (-1- -3)^2] = √(25+4)

= √29.

BC = √[(-1--0)^2 + (1- -3)^2)] = √17

AB =  √[(5- -1)^2 + (-1-1)^2)] = √40

The perimeter = √29. + √17. + √40

=  15.8 to nearest tenth.

Answer:

x = 8

Step-by-step explanation:

Since the triangle is right use Pythagoras' theorem to solve for x

The square on the hypotenuse of a right triangle is equal to the sum of the squares on the other 2 sides, thus

x² + 15² = 17²

x² + 225 = 289 ( subtract 225 from both sides )

x² = 64 ( take the square root of both sides )

x = [tex]\sqrt{64}[/tex] = 8

Answer:

option A

Step-by-step explanation:

Step 1

X

[tex]x=\left[\begin{array}{ccc}b&a\\4&a\end{array}\right][/tex]

Step 2

2Y

[tex]\left[\begin{array}{ccc}2c&2d\\2a&2b\end{array}\right][/tex]

Step 3

X - 2Y = Z

[tex]2Y=\left[\begin{array}{ccc}b&a\\4&a\end{array}\right]-\left[\begin{array}{ccc}2c&2d\\2a&2b\end{array}\right]=\left[\begin{array}{ccc}a&c\\16&b\end{array}\right][/tex]

Step 4

Four equations are formed

Equation 1

b - 2c = a

Equation 2

a - 2d = c

Equation 3

4 - 2a = 16

-2a = 16 - 4

-2a = 12

Equation 4

a -2b = b

-6 - 2b = b

-6 = b + 2b

-6 = 3b

Plug values of a and b in equation 1 and 2

b - 2c = a

-2 -2c = -6

-2c = -6 + 2

-2c = -4

c = -4/-2

a - 2d = c

-6 -2d = 2

-2d = 2+6

-2d = 8

 d = 8/-2

Answer:

a difference of two squares

Step-by-step explanation:

Note that 36 − 16 is a difference of two squares:  6^2 - 4^2.

To find out the total time Mrs. Winter's students spent reading, add up all the fractional hour amounts on the line plot for each student.

In this question, we are dealing with the issue of determining the total time that Mrs. Winter's students spent on reading, using a line plot that displays fractional hours. Unfortunately, without the actual line plot, we can't provide a specific numerical answer. However, the process would involve adding up all the fractional hour amounts for each student. For instance, if one student read for 1/2 hour and another for 1/3 hour, the total would be 1/2 + 1/3 = 5/6 hour. Repeat this addition process for all the students in the class to find the overall total time spent reading.

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The total time which Mrs. Winter's students spend reading last night is: A. 10 3/4 hours.

In Mathematics and Statistics, a line plot is a type of graph that is used for the graphical representation of data set above a number line, while using crosses, dots, or any other mathematical symbol.

Based on the information provided about the fraction of an hour, a frequency table can be computed as follows;

Hour    Frequency

1/4                 10

1/2                  9

3/4                 5

In this context, we can calculate the total amount of time as follows;

Total amount of time = 1/4(10) + 1/2(9) + 3/4(5)

Total amount of time = 10/4 + 9/2 + 15/4

Total amount of time = 10 3/4 hours.

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Answer:

Correct answer is choice B.

Step-by-step explanation:

We have been given a graph and 4 different choices.

Now we need to determine about which of the given functions best fits the points in the graph.

From graph we can clearly see that points are going upward very fast as compared to x when x-value increases.

That happens in exponential type function  which is usually written in form of

[tex]y=ab^x[/tex]

Choice B looks similar to that.

hence correct answer is choice B.

Answer:

604

Step-by-step explanation:

"Top 15%" corresponds to the rightmost area under the standard normal curve to the right of the mean.  That means 85% of the area under this curve will be to the left.  Which z-score corresponds to the area 0.85 to the left?

Using a calculator (invNorm), find this z-score:  invNorm(0.85) = 1.0346.

Which raw score corresponds to this z-score?

Recall the formula for the z-score:

       x - mean

z = ------------------

         std. dev.

Here we have:

       x - 500

z = ------------------ - 1.0364, or x - 500 = 103.64.  Then the minimum score

          100                necessary to be in the top 15% of the scores is

                                  found by adding 500 to both sides:

                                   x = 603.64

Minimum score necessary to be in the top 15% of the SAT scores is 604.

The middle 80% of the distribution ranges from 372 to 628.

The SAT scores form a normal distribution with a mean (")") of 500 and a standard deviation (")") of 100. We need to find:

1. Minimum Score to be in the Top 15%

X = μ + zσ

Calculating the SAT Score:

So, X = 500 + 1.04 * 100 = 604. Therefore, the minimum score necessary to be in the top 15% is 604.

2. Range of Values for the Middle 80%

From a z-score table, the z-scores are approximately -1.28 and +1.28.

X_low = μ + (-1.28)σ  and X_high = μ + 1.28σ

Calculating the Range:

So, the range of scores that define the middle 80% is 372 to 628.

Answer:

B

Step-by-step explanation:

The surface area of this solid is the sum of all the surfaces.

There are 4 rectangular surfaces all around, each measuring 4 by 5 m.

So area of 4 of these surfaces is: 4 * (4*5)= 4 * 20 = 80

The bottom is a rectangle with dimensions 4 and 4. So area is 4 * 4 = 16

There are 4 triangular faces in the top portion, each with base 4 and height 3. Area of triangle is 1/2 * base * height. Hence,

Area of 4 of these triangles is 4*[(1/2)*4*3] = 4 * 6 = 24

Thus, the surface area = 80 + 16 + 24 = 120 m^2

Answer choice B is right.

Answer:

One solution:  y = -1

Step-by-step explanation:

Perform the indicated multiplications:

5y + 5 - y = 3y - 3 + 7, or

4y + 5 = 3y + 4, or

y = -1    This equation has ONE solution:  y = -1

Answer:

-8x^2 + 6x - 14

Step-by-step explanation:

(3x^2 + 4x - 5) - (7x^2 + x + 9) = -4x^2 + 3x - 14

(-4x^2 + 3x - 14) - (4x^2 - 3x) = -8x^2 + 6x - 14

Answer:

the difference is 14

Step-by-step explanation:

Hello

I think  I can help you with this

step 1

Subtracting 3x2 + 4x – 5 from 7x2 + x + 9

[tex]7x^{2} +x+9-(3x^{2} +4x-5)\\=7x^{2} +x+9-3x^{2} -4x+5\\=4x^{2} -3x+14\\[/tex]

Step2

After subtracting 4x2 – 3x from this polynomial

[tex]4x^{2} -3x+14-(4x^{2} -3x)\\4x^{2} -3x+14-4x^{2} +3x\\14[/tex]

the difference is 14

Have a fantastic day,I hope it helps

Answer:

50 mph, 450 mi, 73.3 ft/sec

Step-by-step explanation:

Part 1:

Find the unit rate (which here is mph).

 175 mi

------------- = 50 mph

3.5 hrs

Part 2:

In 8.5 hrs, the Andersons can expect to cover (50 mph)(8.5 hr) = 425 mi

Part 3:

50 mph       88 ft/sec

------------ *  ----------------- = 73.33 ft/sec, or 73.3 ft/sec to the nearest tenth.

      1              60 mph

Answer:

1) f

4 * ¼ = 1 (Multiplicative inverse property)

2) c

6 * 1 = 6 (Identity property of multiplication)

3) h

5 + 7 = 7 + 5 (Commutative property of addition)

4) j

If 5 + 1 = 6 and 4 + 2 = 6, then 5 + 1 = 4 + 2 (Transitive property)

5) a

4(x - 3) = 4x - 12 (Distributive property)

6) i

3(5) = 5(3) (Commutative property of multiplication)

7) k

Rules that allow us to take short cuts when solving algebraic problems.(Properties)

8) d

5 * (3 * 2) = (5 * 3) * 2 (Associative property of multiplication)

9) g

4 + (-4) = 0 (Additive inverse property)

10) e

2 + 0 = 2 (Identity property of addition)

11) b

A + (B + C) = (A + B) + C (Associative property of addition)

Answer:

Step-by-step explanation:

This is a right triangle problem.  The reference angle is x, the side opposite the reference angle is 32, and the hypotenuse is 58.  The trig ratio that relates the side opposite a reference angle to the hypotenuse is the sin.  Filling in accordingly:

[tex]sin(x)=\frac{32}{58}[/tex]

Because you are looking for a missing angle, you will use your 2nd button and then the sin button to see on your display:

[tex]sin^{-1}([/tex]

Within the parenthesis enter the 32/58 and you'll get your angle measure.  Make sure your calculator is in degree mode, not radian mode!!!

Answer:

Step-by-step explanation:

Radius

= 28 ÷ 2

= 14 m

Volume

= 1/3 (3.14) (14)²(48)

= 1/3 (3.14) (196)(48)

= 9847.04 m³

Answer:  A. 9847.04 cubic meters

Step-by-step explanation:

From the given picture, we have

The diameter of the cone = 28 m

Then the radius of the cone = [tex]\dfrac{28}{2}=14\text{ m}[/tex]

Height of the cone = 48 inches

The volume of cone is given by :-

[tex]V=\dfrac{1}{3}\pi r^2h\\\\\Rightarrow V=\dfrac{1}{3}(3.14)(14)^2(48)\\\\\Rightarrow V=9847.04\text{ m}^3[/tex]

Hence, the volume of the cone = [tex]9847.04\text{ m}^3[/tex]

Answer:

Step-by-step explanation:

Answer:

500

Step-by-step explanation:

The experimental probability of breakage is 5 out of 100, or 0.05.

Thus, if the shipment of bulbs numbers 10,000, the expected number of broken bulbs is 0.05(10,000), or 500.

Answer:

The vertex of a quadratic equation corresponds to the point where the maximum or minimum value is located.

If the function has a positive leading coefficient, the vertex corresponds to the minimum value.

If it has a negative leading coefficient,  the vertex corresponds to the maximum valuevalue

If the vertex is located at

(–2, 0)

The possibilities are

y =  (x-2)^2

or,

y = - (x-2)^2

Since the problem tells us the answer, we adopt the positive values

Answer:

y =  (x-2)^2

See attached picture

Answer:

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

Step-by-step explanation:

A graph that is a parabola with a vertex at (–2, 0)

Vertex form of parabola equation is

[tex]y=a(x-h)^2 + k[/tex]

where (h,k) is the vertex

WE are given with vertex (-2,0)

(-2,0) is (h,k)

h=-2 and k=0

Plug the value in vertex form of equation. Lets take a=1

[tex]y=a(x-h)^2 + k[/tex]

Equation becomes [tex]y=1(x-(-2))^2 + 0[/tex]

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

Answer:

a) [tex]S_n=(0.4+0.1n)n[/tex]

b) 15

Step-by-step explanation:

The first time Miguel trains, he runs 0.5 mile, so [tex]a_1=0.5[/tex]

Each subsequent time he trains, he runs 0.2 mile farther than he did the previous time, so [tex]d=0.2[/tex]

Use the formula for nth term of arithmetic sequence

[tex]a_n=a_1+(n-1)d\\ \\a_n=0.5+0.2(n-1)=0.5+0.2n-0.2=0.3+0.2n[/tex]

a) The sum of n terms of the arithmetic sequence is

[tex]S_n=\dfrac{a_1+a_n}{2}\cdot n\\ \\S_n=\dfrac{0.5+0.3+0.2n}{2}\cdot n=(0.4+0.1n)n[/tex]

b) A marathon is 26.2 miles, then

[tex](0.4+0.1n)n\ge 26.2\\ \\0.1n^2+0.4n-26.2\ge 0\\ \\n^2+4n-262\ge 0\\ \\D=4^2-4\cdot (-262)=16+1048=1064\\ \\n_{1,2}=\dfrac{-4\pm\sqrt{1064}}{2}=-2\pm \sqrt{266} \\ \\n\in (-\infty,-2-\sqrt{266}]\cup[-2+\sqrt{266},\infty)[/tex]

Since n is positive and [tex]\sqrt{266}\approx 16.31[/tex], the least number of times Miguel must run for his total distance run during training to exceed the distance of a marathon is -2+17=15

Answer:

A) the bottom left is the correct answer (0.3+0.2k)

B) 15 times

Step-by-step explanation

Answer:

Claire should place the mirror 6 and 1/4 (6.25) inches from each corner of the wall in order for the mirror to be centered.  

Step-by-step explanation:

In order to find out how far the mirror would need to be set from each corner of the wall, you need to first take the total length of the wall and subtract the total width of the mirror:  31 - 18.5 = 12.5.  12.5 inches is the amount of wall space that would be left when the mirror is hanging.  In order for the mirror to be centered, we need to take the amount of wall space left and divide by two (2) to find the measurement from each corner:  12.5 ÷ 2 = 6.25 or 6 1/4.  By placing the mirror 6.25 inches from each corner of the wall, the mirror will be centered on the wall.

Answer:

a) The minimum y-value of f(x) is -3

d) The minimum y-value of g(x) is -3

Step-by-step explanation:

Given in the question that,

f(x) = 3[tex]^{x}[/tex]-3

g(x) = 7x² - 3

At large negative exponents, the value approaches to zero

y = [tex]3^{-100}-3=-3[/tex]

y = [tex]3^{-1000}-3=-3[/tex]

y = [tex]3^{-10000}-3=-3[/tex]

Minimum y-value of g(x) will be when x = 0

y = 7x² - 3

y = 7(0) - 3

y = -3

Answer :B and D

explanation: that’s correct

Answer:

Each sweater costs $35.

Step-by-step explanation:

First subtract the total price ($160) by the price of the shirt ($20).

160 - 20 = 140

Now were left with $140. Since Katie bought 4 sweaters, divide 140 by 4.

140/4 = 35

This means that each sweater was $35. If you want to make sure this is correct just multiply 35 by 4 and then add the $20. You should end up with $160.

35 x 4 = 140

140 + 20 = 160

Answer:

[tex]\boxed{\text{3. }\dfrac{7\pi}{30} \text{; 4. } -20^{\circ}\text{; 5. } -\dfrac{720^{\circ}}{\pi}}[/tex]

Step-by-step explanation:

Question 3

[tex]42^{\circ} \times \dfrac{\pi}{180^{\circ}} = \boxed{\dfrac{7\pi}{30}}[/tex]

Question 4

[tex]-\dfrac{\pi}{9} \times \dfrac{180^{\circ}}{\pi}= \boxed{-20^{\circ}}[/tex]

Question 5

[tex]-4\times \dfrac{180^{\circ}}{\pi}= \boxed{-\dfrac{720^{\circ}}{\pi}}[/tex]

The temperature in degrees Celsius is 20°C.

To calculate the temperature in degrees Celsius, we can use the formula:

C = 5/9 (F – 32)

Given that the temperature outside Brayden's window is 68°F, we plug this value into the formula:

C = 5/9 (68 - 32)

Now, we perform the calculations:

C = 5/9 (36)

C = (5/9) * 36

C = 20

Therefore, the temperature outside Brayden's window is 20°C.

To explain further, the formula C = 5/9 (F – 32) is used to convert Fahrenheit to Celsius. First, we subtract 32 from the Fahrenheit temperature to get the difference in scale between Celsius and Fahrenheit. Then, we multiply by 5/9 to convert the difference into Celsius. Finally, we add the Celsius symbol to indicate the temperature scale. In this case, when we apply this formula to 68°F, we find that it equals 20°C.

Complete question:

Brayden read the thermometer outside his window. It said that it was 68°F. What is the temperature in degrees Celsius? Use the formula C = 5/9 (F – 32) where C represents the temperature in degrees Celsius and F represents the temperature in degrees Fahrenheit.

The temperature in degrees Celsius is 20°C.

To convert 68°F to degrees Celsius, use the formula [tex]\( C = \frac{5}{9} \times (F - 32) \).[/tex]

Substituting 68 for  F :

[tex]\[ C = \frac{5}{9} \times (68 - 32) \][/tex]

Simplifying inside the parentheses:

 [tex]\[ 68 - 32 = 36 \][/tex]

Applying the multiplication:

[tex]\[ C = \frac{5}{9} \times 36 \][/tex]

Divide 36 by 9:

[tex]\[ C = 5 \times 4 = 20 \][/tex]

Thus, the temperature in degrees Celsius is 20°C.

Answer:

Would this be science?

Step-by-step explanation: