# For a house call, a veterinarian charges $70, plus$40 an hour. How do you write an equation that represents the total fee?

$70 + 40 x$
The flat fee is $70, so you must be adding 70 to something. Since it says 40 dollars an hour, and you don't know how many hours, you use 40x. So, the end result would be $70 + 40 x\$.