Question

A boy weighs x pounds. His younger sister weighs 53 pounds less than him. His father weighs four times as much as his sister. A simplified expression that represents the father's weight (in pounds) is

Answer 1

Let's say his father's weight is f(x). So, here's your expression:
$f(x)=4(x-53)$

You could simplify if you'd like to:
$f(x) = 4x-212$

And that's your simplified expression!