Question

????? Help please ......

Answer 1

R = 3.6 and A = 2

Explanation:

Given that R varies inversely to A then the equation relating them is

R =
`(k)/(A)` ← k is the constant of variation

To find k use the condition R = 12 when A = 1.5

k = RA = 12 × 1.5 = 18

R =
`(18)/(A)`

(a) when A = 5, then

R=
`(18)/(5)` = 3.6

(b) when R = 9

9 =
`(18)/(A)` ( multiply both sides by A )

9A = 18 ( divide both sides by 9 )

A = 2