Question

Truck rents out for $30 plus 0.80 per mile what is the variable cost of renting the truck

Answer 1

30+0.80x should be your answer

Answer 2

The variable cost is $0.80 per mile, because that part of the equation can generate a different number per x miles

$30 is the fixed amount, because no matter how much miles you drive, you still have to pay $30 on the spot

hope this helps