Martha is going to the doctor for a series of appointments. Her total cost over the course of the visits will be equal to $140 for the treatment plus $20 per appointment a. If her total bill is $220 how many appointments did she have? Please use variables when answering the question.

the answer is 0.071

good luck! : d

answer: since the question is talking about growth you have to use the growth formula which is inital amount (1 + growth)^time

step-by-step explanation:

the intial amount is 1200, the growth is 4.8, and the time is 7. plug those numbers into the equation, also i think you have to change 4.8 into a percent. but, i have forgotton how to do that. if this is a online class go on to the lesson.

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.