Question

The Hydro water department has a monthly service charge of $15.70 and a volume charge of $1.21 for every 100 cubic feet of water.
The total monthly cost is equal to the service charge plus the charge for the volume used during the month. If we let x represent the number of cubic feet of water (in hundreds) and y represent the total monthly cost, then we have:
total monthly cost = volume charge + service charge
y = 1.21x + 15.70

If the Johnson family used 300 ft3 less water this month than last month, then they can expect
an increase in their water bill of $47.10.
an increase in their water bill of $3.63.
a decrease in their water bill of $47.10.
a decrease in their water bill of $3.63.

Answer 1

well, y is the total monthly cost.

Answer 2

yes

Answer 3

so you know automatically that they are going to have a decrease so you know it is either c or d.

Answer 4

yeah

Answer 5

if you multiply the 1.21 by 3(since it is per 100 cubic) you would get 363, so i would say your answer is D.

Answer 6

thank you very much you are right

Answer 7

no prob :)

Answer 8

sometimes its just a matter of trying different things till you get an answer.

Answer 9

your right you should be a math teacher

Answer 10

haha, im not old enough for that ;) i gotta get through high school first!

Answer 11

lol