Can someone help with this maths question please? :)

q is directly proportional to the square of r

q = 3 when r = 4

(a) find a formula for q in terms of r

(b) work out the value of q when r = 8

Thanks alot :)

Don't be :(

"q is directly proportional to the square of r" means that q = kr² where k is a constant number which we need to find.

Putting in the given values we get: 3 = k(16) so k = 3/16

a) So the formula is q = 3r²/16

b) When r = 8 we get q = (3 x 8²)/16 = (3 x 64)/16 = 3 x 4 = 12

So :) now.