The Schwartz family spent a total of $111.75 for Internet service for 3 months. Each month they received $5.50 as a credit on the bill. Which equation and solution shows

the cost of their monthly Internet service before the credit?

3 (x + 5.50) = 111.75; the monthly Internet service is $31.75

3 (x - 5.50) = 111.75; the monthly Internet service is $42.75

1/3 (x - 5.50) = 111.75; the monthly Internet service is $42.75

1/3 (x + 5.50) = 111.75; the monthly Internet service is $31.75

3 (x - 5.50) = 111.75

Step-by-step explanation:

They paid $111.75 for three months,  that means they minus $5.50 every month which means a total of $16.5 for three months.

So you need use $111.75 plus the credit $16.5 for three months

111.75 + 16.5 = 128.25

Then use divide them by 3, (three months)

128.25 / 3 = 42.75

So they pay $42.75 per month before the credit.

I wish this could help you.

b

Step-by-step explanation:

because i just took the test

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: