Question

Adam is selling yarn for $.04/foot. How many feet can you buy from him for $0.52?

Answer 1

Let's make the amount of feet a variable, x.

So we have a function f(x)=0.04x as yarn is $0.04 a foot.

Now they want you to spend $0.52 on yarn, so f(x)= 0.52.

∴f(x)=0.04x=0.52

0.52=0.04x

x=0.52 /0.04

x=13

ANS: 13 feet.