Acar rental cost $80 per day, for the first 250 miles, plus $0.20 for each additional mile. if sonya's rental cost was $124 for one-day rental, how many miles did she drive?

Well, 80 dollars is the price originally, so that 80 is by its self. Now we see that its 0.2 ever mile after so lets do the math.

The equation would be $80 + $0.2x = 124

Do the math, subtract 80 from both sides

0.2x = 44

No divide by 0.2

x= 220

since the first $80 is 250 miles what would the rest be? well since you did the math and got x = 220 that means after you have 220 addition miles. Add the two up :) 220+250= 470 :D