What's the circumference of a circle with a diameter of 31 inches

The length of the building in the scale drawing is; 31. 25 Inches

From the given, we have that Scale drawing was used 0. 25 inches represents 2 feet

The length of the building = 250 feet

Then, 0. 25 inches = 2 feet

Then, x inches = 250 feet

Now cross multiply

x × 2 = 0. 25 × 2500

Multiply through, we have;

2x = 62. 5

Make 'x' the subject by dividing both sides by 2

2x/2 = 62. 5/ 2

x = 31. 25 Inches

Thus, the length of the building in the scale drawing will be; 31. 25 Inches.

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Answer:

Choice A

Step-by-step explanation:

The line we need to find has the same slope as the slope of the given line which is 3.

The formula in terms of x and y for dy/dx is -3y/x

The value of dy/dx at the point (81,16) is -0.5926

The question is incomplete, the full question is given below:

A manufacturer can produce 2970 cell phones when x dollars is spent on labor and y dollars is spent on capital. the equation that relates x and y is [tex]55x^{\frac{3}{4} } y^{\frac{1}{4} } =2970[/tex]

a. Find a formula in terms of x and y for [tex]\frac{dy}{dx}[/tex]

b. Find the value of      dy/dx at the point (81,16). Round your answer to 4 decimal places

Part a

A formula in terms of x and y for [tex]\frac{dy}{dx}[/tex]

We differentiate equation that relates x and y with respect to x by implicit differentiation:

=[tex]\frac{d}{dx} (55x^{\frac{3}{4} } y^{\frac{1}{4} } )=\frac{d}{dx} (2970)[/tex]

=[tex]55(x^{\frac{3}{4} } \frac{d}{dx} (y^{\frac{1}{4} } )+y^{\frac{1}{4} } ((x^{\frac{3}{4} } ))=0[/tex]

=[tex]x^{\frac{3}{4} } y^{\frac{-3}{4} } \frac{dy}{dx} =3y^{\frac{1}{4} } x^{\frac{-1}{4} }[/tex]

= [tex]\frac{dy}{dx} =\frac{-3y^{0.5}x^{-0.5} }{x^{0.75}y^{-0.75} }[/tex]

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

=-3y/x

Part b

Value of dy/dx at the point (81,16)

dy/dx at (81,16), x=81, y=16

dy/dx=-3y/x

dy/dx=-3*16/81

dy/dx=-48/81

dy/dx=-16/27

        =-0.5926  

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Answer: y=-1/8x

Step-by-step explanation:

Choose a point that the perpendicular line will pass through.

(0,0)

Use the slope-intercept form to find the slope.

m=8

The equation of a perpendicular line must have a slope that is the negative reciprocal of the original slope.

perpendicular

m= −1/8

Find the equation of the perpendicular line using the point-slope formula.

y+0=−1/8⋅(x+0)

Write in

y=mx+b

form.

y=−1/8x

Hope this helps

The inequality for the expression will be represented by n > 5.

The parameters present shows a geometric sequence. A Geometric sequence is the one in which the ratio between the consecutive terms remains constant. The constant ratio is called common ratio. The nth term of geometric sequence is represented by Tₙ = arⁿ⁻¹ where n is the number of terms, r is common ratio and a is the first term. Here, a = 15 and r = 3. Now, for the people to be more than 3000 the inequality can be written as

arⁿ⁻¹ > 3000

15 (3)ⁿ⁻¹ > 3000

3ⁿ⁻¹ > 200

Taking log on both sides

log 3ⁿ⁻¹ > log 200

(n - 1) > log 200/log 3

n - 1 > 4.82

n > 5.82

Rounding off we get

n > 5 which is required inequality.

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⇒Logically we know that to find the  [tex]3^{rd}[/tex] term we use [tex]T_{3} =a+2d[/tex]

⇒From

[tex]T_{3} =a+(3-1)d\\T_{3}=a+2d[/tex]

⇒And the [tex]4^{th}[/tex] is equal [tex]T_{4} =a+3d[/tex] from the same method I used above from the general equation of finding the [tex]n^{th}[/tex] term.

⇒It is said the sum of [tex]T_{3}[/tex] and [tex]T_{4}[/tex] is -2  meaning

[tex]T_{3} +T_{4} =(a+2d)+(a+3d)\\-2=a+2d+a+3d\\-2=a+a+2d+3d\\-2=2a+5d[/tex]

⇒It is also said that [tex]T_{2}[/tex] is 2 and we know at this point that

[tex]T_{2} =a+d\\2=a+d[/tex]

⇒Then we can use the simultaneous equations technique to find the value of d.

I will use the substitution method by deriving the third equation from the second equation 2=a+d

a=2-d  is the [tex]3^{rd}[/tex] equation that I will substitute in the  equation

In the place of a it means I will plug in  2-d in the place of a.

[tex]-2=2a+5d\\-2=2(2-d)+5d\\-2=2(2)+2(-d)+5d\\-2=4-2d+5d\\-2-4=3d\\\\3d=-6\\\\[/tex]

[tex]\frac{3d}{3} =\frac{-6}{3} \\d=-2[/tex]

NOTE if you were also asked to find the value of a you can use the equations above to find the value of a which is the first term. the difference represented by letter d is -2.

GOODLUCK!!

Answer:

1,3,5,7,17,23

Step-by-step explanation:

15x + 25 y = 230 and x - y = 2 is a system of equations that could be used to calculate the number of hours Mamadou worked and Brianna worked.

Given:

Mamadou can iron 15 shirts in one hour, whereas Brianna can do 25. Mamadou put in two more hours of work than Brianna, and the two of them combined to iron 230 shirts.

Let y be the number of hours Brianna, works, and x be the number of hours Mamadou  works.

In y hours, Brianna would iron 25y shirts.

In x hours, Mamadou would iron 15x shirts.

Combining total number of shirts,

15x + 25 y = 230

Since, Mamadou put in two more hours of work than Brianna.

x = y +2

x - y = 2

Therefore, for the number of hours Mamadou and Brianna worked, a system of equations 15x + 25 y = 230 and x - y = 2 could be utilised.

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Answer:

15x + 25 y = 230 and x - y = 2

Step-by-step explanation:

Answer:

You should ask your teacher what the heck that means!

Step-by-step explanation:

But still, -7+10=3

Answer:

5.5 oz

Step-by-step explanation:

154÷28

Answer:

slope = [tex]\frac{4}{3}[/tex]

Step-by-step explanation:

calculate the slope m using the slope formula

m = [tex]\frac{y_{2}-y_{1} }{x_{2}-x_{1} }[/tex]

with (x₁, y₁ ) = C (1, 3 ) and (x₂, y₂ ) = B (4, 7 )

m = [tex]\frac{7-3}{4-1}[/tex] = [tex]\frac{4}{3}[/tex]

Answer:

Step-by-step explanation:

Set 3y+53 equal to 7y-55

3y+53=7y-55 //subtract 3y

53=4y-55 //add 55

108=4y //divide by 4

y=27

Option (C) is correct which is the equation 4 w + ( − 4 p ) = 8 . 00 is the result of subtracting the second equation in the system from the first equation.

Mai and Tyler are selling items to earn money for their elementary school.

Mai sells 14 wreaths and 3 potted plants and the school earns $70.50. Mathematically we can write,

14 w + 3 p = 70.50                          equation 1

Tyler sells 10 wreaths and 7 potted plants and the school earns $62.50. Mathematically we can write,

10 w + 7 p = 62.50                           equation2

equation 1 - equation 2 , we get

4 w + ( - 4 p ) = 8.00

which is the required equation.

We can conclude that the equation 4 w + ( − 4 p ) = 8 . 00 is the result of subtracting the second equation in the system from the first equation

So, option (C) is correct.

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Answer: 50

Step-by-step explanation: Common factor of 150 and 350 = 1, 2, 5, 5. Highest common factor of 150 and 350 = 2 × 5 × 5 = 50.

Answer:

W

Step-by-step explanation:

9 + 7 = 16 and P is the 16th letter of the English Alphabet

4 + 1 = 5 and E is the 5th letter of the English Alphabet

15 + 8 = 23 and W is the 20th letter of the English Alphabet

To determine whether or not this system has a solution, we proceed as follows:

Now, we use the quadratic function to solve, that is:

From this, we have that the system has two solutions, we determine which replacing x in one of the functions, that is:

One solution is the point (-1, 4).

And, another solution is the point (-5, 8).

We can see each solution in the following graph:

B = 47°

a = 10.9

b = 11.7

How are the angles and sides of the right triangle calculated?

a) Finding B

We know that ,the sum of every angles of a triangle = 180°

So, B + 90° +43° = 180°

     B+ 133° = 180°

     B = 180° - 133°

        =47°

b) Finding a

We know,

[tex]sin\theta =\frac{opposite}{hypotenuse} \\\\sin 43^{\circ} =\frac{a}{16} \\\\a= 16(sin 43^{\circ})\\\\a = 16 (0.681)\\\\a=10.9[/tex]

c) Finding b

We know,

[tex]cos\theta = \frac{adjacent}{hypotenuse} \\\\cos 43^{\circ} =\frac{b}{16} \\\\b = (cos 43^{\circ})16\\\\b= (0.731) 16\\\\b= 11.7[/tex]

What is a right triangle?

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Answer:

$74.00

Step-by-step explanation:

Two tickets at $37 apiece, we cal calculate a total by adding 37 + 37,

OR by multiplying

2×37

Either way, the total works out to be $74

The equation that is parallel to y = -3x + 7 and passes through the point (2, -1) is y=-3x+5.

The slope intercept form in math is one of the forms used to calculate the equation of a straight line, given the slope of the line and intercept it forms with the y-axis.

y=mx+b

where m is the slope of the line and b is the y intercept.

The slope of the given equation,

y=-3x+7 is -3.

So, to write an equation parallel to the given equation and set of points, use point slope form and the slope of -3

y-y₁=m(x-x₁)

where (2,-1)  are x₁, y₁

y-(-1)=-3(x-2)

y+1=-3(x-2)

Multiply with 3 on RHS side

y+1=-3x+6

We have to write in slope intercept form, so shift 1 to RHS.

y=-3x+6-1

y=-3x+5

As you can see, the slope of this line is -3

, which means that the two equations are parallel to each other.

Hence y=-3x+5 is the equation that is parallel to y = -3x + 7 and passes through the point (2, -1).

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If the children sold 50 cups of lemonade one the first day and 90 cups on the second day. then the percentage increase in the number of lemonade cups sold 80%

The number of cups of lemonade sold on first day =  50 cups

The number of cups of lemonade sold on second day = 90 cups

The percentage increase = (New value - Old value)/Old value × 100

Substitute the values in the equation

The percentage increase in the number of lemonade cups sold

= [tex]\frac{90-50}{50}[/tex]×100

= 0.8×100

= 80%

Hence, if the children sold 50 cups of lemonade one the first day and 90 cups on the second day. then the percentage increase in the number of lemonade cups sold 80%

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Answer:

90-50/50 = P/100

Step-by-step explanation:

This is the correct answer on T4L!

1) Notice that, in this case, the center is at (0,0) the focus at (0,4) and the Vertex is at (0,7)

2) Since the focus is at the y-axis, and the center is at the origin we can start from the following formula:

Answer:

  y +7 = 3(x +4)

Step-by-step explanation:

You want the point-slope equation of the line with slope 3 through point (-4, -7).

The point-slope equation of a line with slope m through point (h, k) is ...

  y -k = m(x -h)

For m=3 and (h, k) = (-4, -7), this is ...

  y -(-7) = 3(x -(-4)) . . . . . substitute for m, h, k

  y +7 = 3(x +4)

The solution the inequality expression given as 2(7-4k) > 12 or 5 < 0.2(15k + 10) is 0.25 > k > -0.4

Inequality expressions are mathematical statements that are represented by variables, coefficients and operators where the opposite sides are not equal

The inequality expression is given as

2(7-4k) > 12 or 5 < 0.2(15k + 10)

Open the brackets

So, we have

14 - 8k > 12 or 5 < 7.5k + 2

Collect the like terms

So, we have

- 8k > 12 - 14 or 5 - 2 < 7.5k

Evaluate  the like terms

So, we have

- 8k > -2 or -3 < 7.5k

Divide both sides by the coefficient of k

So, we have

k < 0.25 or -0.4 < k

Rewrite as

0.25 > k or k > -0.4

Combine

0.25 > k > -0.4

Hence, the solution is 0.25 > k > -0.4

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Table A doesn't represent the constant of proportionality.

Table B doesn't represent the proportional relationship.

Treat the values in table as (x,y) values. The result is a linear function

For A, 85/5 = 17 while 79 / 10 = 7.9. This doesn't illustrate a constant.

For B, 1.49/16 and 1.59/20 have different values. In this case, 1.49/16 = 0.093 and 1.59/20 = 0.0795.

Therefore. they don't have a constant of proportionality. This was because the values that were gotten for both A and B aren't equal.

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Decide whether each table could represent a proportional relationship. If the relationship could be proportional, what would the constant of proportionality be?

1. How loud a sound is depending on how far away you are

5 85

10 79

20 73

40 67

b. The fountain drinks at hot dog hut.

16 1.49$

20 1.59$

30 1.89$

Answer: cosφ=-3/5

Step-by-step explanation:

[tex]\displaystyle\\sin\phi=\frac{4}{5} \ \ \ \ \ 90^0 < \phi < 180^0\\\\sin^2\phi+cos^2\phi=1\\\\\cos^2\phi=1-sin^2\phi\\\\cos^2\phi=1-(\frac{4}{5})^2\\\\ cos^2\phi=1-\frac{16}{25} \\\\cos^2\phi=\frac{1(25)-16}{25}\\\\ cos^2\phi=\frac{25-16}{25} \\\\cos^2\phi=\frac{9}{25} \\\\cos\phi=б\sqrt{\frac{9}{25} } \\\\cos\phi=б\sqrt{\frac{3^2}{5^2} }\\\\cos\phi=б\sqrt{(\frac{3}{5})^2} \\\\cos\phi=б\frac{3}{5} \\\\90^0 < \phi < 180^0\\\\Hence,\ \\\\cos\phi=-\frac{3}{5}[/tex]

Answer:

C

Step-by-step explanation:

when u take the 2 shortest sides and add them up, they must be greater than the longest length.

The ratio (new to original) of the perimeters is equal to 1/2 or 0.5. Also, the ratio (new to original) of the areas is equal to 1/4 or 0.25.

In Mathematics, the ratio of the perimeters of two (2) geometric figures would be equal to the scale factor when the two (2) geometric figures are similar;

Mathematically, the scale factor of a geometric figure can be calculated by using this formula:

Scale factor, z = Dimension of image/Dimension of original figure = y/x

Scale factor, z = 1/2 or 0.5.

In Geometry, the ratio of the areas of two (2) geometric figures would be equal to the square of scale factor when the two (2) geometric figures are similar.

Scale factor, z = (y/x)²

Scale factor, z = (1/2)²

Scale factor, z = 1/4 or 0.25.

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Complete Question:

Dilate a square with vertices (0, 0). (0, 4). (4, 4), and (4, 0) using the scale factor k = 0.5. What is the value of the ratio (new to original) of the perimeters? the areas?

The ratio of the perimeters is

The ratio of the areas is

Answer: 3x - 10 = -3x + 8 Add 3x to both sides 6x - 10 = 8 Add 10 to both sides 6x = 18 Divide both sides by 6x = 3

Step-by-step explanation: