The circumference C of a circle is a function of its radius given by C ( r ) = 2 π r C ( r ) = 2 π r . a. Express the radius of a circle as a function of its circumference. Make sure you use function notation. b. Evalute the function you found in part a. r ( 64 π ) = r ( 64 π ) = c. Explain the meaning of the equation in part b in a complete sentence

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

is there any photos or whatever?

hi there!

the answer will be d: 2

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15