1. If theintensity of a sound, I,varies directly as the number of watts, W,and inversely as the square of the distance, D,(in meters), give an equation that we could use to compute the constant of variation.

Select one:

A.

I = k / W D²

B.

I = k W D²

C.

W= kI / D²

D.

I = k / W / D²

E.

I = k W / D²

2. Suppose it takes five hours to fill your pool with a water hose. Suppose your pool has a volume of 900 cubic feet. Design a variation formula which would show how theVolume of the pool varies with the timeit takes to fill upthe pool, and compute the constant of variation.

Select one:

A.

t= k / V

k = 5 hoursX 900 cubic feet

k = 450

B.

V= k t

k = 900 cubic feet / 5 hours

k =180

C.

t= k / V

k = 900 cubic feetX 5 hours

k = 4500

D.

t= kV

k = 5 hours / 900 cubic feet

k =1 / 180

4. Suppose you have a digital photo in Microsoft Paint. Suppose you look at the attributes, and find the photo is 12.5 inches(1200 pixels)wide and 8.16 inches (780 pixels) high. Suppose you want the photo to be 6 inches wide and preserve the aspect ratio, by what percent to you want tostretch orshrink the photo horizontally and/or vertically?

Select one:

A.

Shrink the photo horizontally to 52%

Shrinkthe photo verticallyto 52%.

B.

Stretch the photo horizontally by 148%

Stretch the photo verticallyby 148%.

C.

Shrink the photo horizontally to 48%

Shrink the photo verticallyby 48%.

D.

Shrink the photo horizontally to 0.48%

Shrink the photo verticallyto 0.48%.

E.

Stretch the photo horizontally by 208%

Stretch the photo verticallyby 208%.

5. Thearea of a circle varies directly withthe square of its radius, and the circumference of a circle varies directly withits diameter (where the constant of proportionality is for both the area and circumference of a circle, and the diameter is twice the radius).If a circlehasan area of 100inches²,what is its circumference?

Select one:

A.10 inches

B.20 inches

C.20 inches

D.10 inches

6. In Fahrenheit, water freezes at 32 degrees and boils at 212 degrees.

In Celsius, water freezes at zero degrees and boils at 100 degrees.

How could we set-up the information we knowabout temperature in order to derive a formula that we could use toconvert from Celsius to Fahrenheit?

Select one:

A.F - 0 = (212 -0) / (100 - 32) (C - 32)

B.F - 32 = (212 -32) / (100 - 0) (C - 0)

C.C - 32 = (100 - 0) / (212 -32) (F - 0)

D.F - 32 = (100 - 0) / (212 -32) (C - 0)

E.C - 0 = (100 - 0) / (212 -32) (F - 0)

7. The area, A,of a triangle varies jointly with the base, b,and the height, h. If the base is 10, the height is 20, and the area is 100, on one triangle, find the Area of a triangle with base of 3 feet and a height of 6 feet.

Select one:

A.18 square feet

B.36 square feet

C.4.5 square feet

D.9 square feet