Roy is correct. When you multiply fractions, you multiply the numerator of one fraction and the other numerator of the other fraction, and vice versa for denominator.
7 x 3 = 21 (Numerators)
——- —-
3 x 8 = 32 (Denominators)
I hope this helped!
Answer: 94.24 feet.
Step-by-step explanation:
1. To solve this exercise you must apply the formula for calculate the perimeter of a circle, which is shown below:

Where
is the radius of the circle.
2. You can calculate the radius of the circle by dividing the diameter by 2, as following:

3. Substitute this value into the formula. Then, you obtain that the result is:

Y and x are directly proportional, as stated by hypothesis. Let's use the rule of three to find y when x = 8.
x=5 --> y=12
x=8 --> y=?
? = (8*12)/5 = 96/5 = 19.2
So y directly varies with x, and y=12 when x = 5, then y=19.2 when x=8.
Hope this Helps! :D