Question

michael pays $30 to enter a state fair plus $4 for each ride. Which of the following equations represent his total cost?

Answer 1

Michael pays a fixed $30, so lets put that by itself.
$30
Michael also has to pay $4 for each ride, so lets use a variable for that. I'll use r.
$4r
Now, since the problem said plus, we know to add.
$30 + $4r
That's your equation.