Solving Problems with Rational Numbers

-2 + 4 

• -2

• 2

• 0

• -4

-9 + (-5)

• -14

• 14

• -4

-7 - 2

• -9

• 9

• 5

• -5

44/-4=

• -11

• 11

• 176

• -176

-6 - (-8)

• -2

• 2

• -14

• 14

Evaluate the expression.
|–5| + 8

• 3

• 13

• -13

• -3

A bank charges a service fee of $7.50 per month for a checking account. A bank account has $85.00. If no money is deposited or withdrawn except the service charge, how many months until the account balance is negative?

• 10 months

• 11 months

• 12 months

• 13 months

The table shows transactions in a checking account. Find the total of the transactions for each month. Find the mean total for the four months.

Month	Transactions
January	-38.50, 126.30, 429.40, -265.00
February	250.00, -135.20, 35.50, -62.30
March	-14.00, 99.90, -82.70, -1.50
April	-86.80, -570.00, 100.00, -280.10

A furniture store pays a wholesale price for a mattress. Then, the store marks up the retail price to 150% of the wholesale price. Later, they put the mattress on sale for 50% off of the retail price. A customer just bought the mattress on sale and paid $1,200. What was the retail price of the mattress, before the discount?

A restaurant bill is $21. You leave a 15% tip. How much do you pay including the tip?