Which go together will reward brainliest

We need to solve for the radius. So using the "formula" for the surface area, we have

900*pi ft^2 = 4*pi*r^2       divide by pi

900 ft^2 = 4*r^2    divide by 4

225ft^2 = r^2         take the square root of each side

15 ft = r

This should give you tools to answer all the questions.  

the answer is a

step-by-step explanation:

30.5*10=350$

you have to multiply the number without the decimal point then add it later but if its tenn u must move the place value of the decimal point 1 to the right.