Develop Expressions from Real-World Problems

Allie has $30; she gets d dollars for her birthday. Which expression represents the amount of money she has now?

• 30 - d
• 30 + d
• 30d
• d -30

Each week, Mark earns $350.  He spends d dollars during the week.  Which expression represents the amount of money he has left at the end of the week?

• 350 - d
• d - 350
• 350 + d
• 350d

An electrician charges a $50 fee to travel to your house. He also charges $20 per hour that he is working.  Write an expression to represent how much money he will make in y hours.

• 50y + 20
• 20y + 50
• 20 + y + 50
• 20y - 50

You have a container that has L cups of water. You accidentally spill 2 cups of water. Write an expression that represents the amount of water that is left in the container.

•  L - 2
• 2  - L
•  2 + L
• 2L

Adriana has 5 cans of soda. She needs to buy several more cases (c) of soda for a picnic.  Each case has 24 cans. Which expression would show how many cans of soda Adriana has altogether?

• 24c + 5
• 24 + 5
• c+ 5
• 24c - 5

A blade of grass triples in height every month. Write an expression for the height of a blade of grass after one month of growth if its original height was h.

• 3 + h
• 3 - h
• 3h
• h - 3

Tom gives you $2 per day. How much money will you have after t days?

• 2 + t

• 2 - t

• 2t

• 2/t

Fred is going to a carnival. There is an $8 entrance fee, and rides cost $3 a piece. Write an algebraic expression that will give the amount of money Fred spent if he rode r number of rides. 

• 8 + 3r
• 8 + 3 + r
• 8r + 3
• 8r - 3

A website charges $2 to download each game and $12.49 membership fee. Write an expression that gives the total cost in dollars to download "g" games. 

• 12.49g + 2
• 2g + 12.49
• 2 + 12.49
• g + 12.49 + 2

A cell phone carrier charges $40 a month along with a $5 fee for each gigabyte of data used. Which expression represents the amount charged if g gigabytes of data is used.

• 40g + 5

• 5g + 40

• 5g - 40

• 5 + g + 40