Question

F is directly proportional to A. if F=72 when A=9 find F when A=7

Answer 1

56 is your answer.

Equation for direct proportion is y = kx where k is the constant of proportionality. For your letters, it’s f = ka

We know 72 =k9, so k = 8
Then they want you to solve
f = 8•7
f = 56