Per 1 yard the cost would be $0.38. Not sure what unit you need it in, but thats the answer in yards.
THE SURFACE AREA IS 3220CM^2
Answer:
see explanation
Step-by-step explanation:
let y = f(x) and rearrange making x the subject, that is
y = 5x + 4 ( subtract 4 from both sides )
y - 4 = 5x ( divide both sides by 5 )
= x
Change y back into terms of x
(x) = 
The area of a circle if the diameter is 80 is
A=5026.55