Question

solving problems using the four operations with negative numbers
▶ solve each problem. show your work.
1 simplify 2.4(-3.3 - 0.9 + 1.2).
2 simplify -1(15 + 4 - 27).
3 dave has $358.00 in his bank account. he wants to prepay his cell phone bill for the next three months. his monthly cell phone bill is $78.50. he also needs to pay his electric bill, which is $135.00. how much money will dave need to add to his account to cover all the bills?
4 amy borrows $132.72 to buy supplies for her birthday party. she receives gifts and money from her friends and family. the total amount of money that amy receives is $250.50. how much money does amy have after she pays back what she borrowed?

Explanation:

Step1: Calculate the total cost of Dave's bills

Dave's cell - phone bill for three months is \(3\times78.50 = 235.5\) dollars. Add the electric bill of \(135\) dollars. So the total cost is \(235.5+135=370.5\) dollars.

Step2: Find out how much more money Dave needs

Dave has \(358\) dollars. Subtract the amount he has from the total cost: \(370.5 - 358=12.5\) dollars.

Step3: Calculate Amy's remaining money

Amy has \(250.50\) dollars and owes \(132.72\) dollars. Subtract the amount she owes from the amount she has: \(250.50-132.72 = 117.78\) dollars.

Answer:

1. Dave needs to add \(\$12.50\) to his account.
2. Amy has \(\$117.78\) after paying back what she borrowed.