Question

I need answer for this any one help me please​

Answer 1

C = 97.20

Explanation:

Given that C varies as r² then the equation relating them is

C = kr² ← k is the constant of variation

To find k use the condition C = 202.80 when r = 2.6

k =
`(C)/(r^(2) )` =
`(202.8)/(2.6^(2) )` = 30

C = 30r² ← equation of variation

When r = 1.8, then

C = 30 × 1.8² = 97.20