evelyn needs atleast $112 to buy a new dress. She has already saved $40 . She earns $9 an hour babys

evelyn needs atleast $112 to buy a new dress. She has already saved $40 . She earns $9 an hour babysitting. How many hours will she need to babysit to buy the dress?

Let the number of hours be h.

We have the earnings function E(h) below
E(h) = hourly rate * h + current savings
E(h) = 9h + 40

We're told E(h) = 112, so we have:
9h + 40 = 112

Typing this equation in our math engine and we get:
h = 8