Question

If f(x) varies directly with x, and f(x) = 72 when x = 8, find the value of f(x) when x = 3.

A.
9

B.
18

C.
27

D.
192
will fan and medal i need answer soon as possible

Answer 1

If it varies directly, then you have \[f(x)=m*x\]. As you know the value of x and the value of f(x), then,
\[72=m\cdot8\]
You can know answer the question because it is the value of m.

Answer 2

D?

Answer 3

ty so much

Answer 4

D is a little bigger, I think A fits better,
\[72=9\cdot8\]

Answer 5

You're welcome.