50 + 20h = 100 + 10h
20h - 10h = 100 - 50
10h = 50
h = 50/10
h = 5 <== they will charge the same at 5 hrs
fifty five hundredths is equal to 0.55
800-50=750 so 750+50=800 the dryer maybe go be 750
The answer is A because 8 is where you started and each time the x number goes up by on the y number goes down by seven (-7)