Modelling with Expressions

A plumber charges $25 for a service call plus $50 per hour of service. Write an equation that represents this situation

• y = 25 + 50x

• y = 50x + 25

• y = 25x + 50

• y = 50 + 25

Amani buys a new car for $14,000. The car depreciates (decreases) in value $1100 every year. Write an equation to represent the value of her car.

• y = 14000 + 1100x

• y = 14000x + 1100

• y = 14000 - 1100x

• y = 14000x - 1100

You have $50 and are buying some movies on videocassettes that cost $15 each. Write an expression that shows how much money you have left after buying n movies.

• 50 + 15n

• 50 - 15n

• 50n + 15

• 50n - 15

Perry has 17 fewer baseball cards than Pete.

If b represents the number of cards Pete has, write an expression for how many baseball cards Perry has.

• b + 17

• b - 17

• 17 + b

• 17 - b

Mrs. Bembry puts $10 in a savings account each month and an extra $20 when she receives money for her birthday. If her birthday was this week, which expression represents the amount she has saved this year?

• 20m + 10

• 20m - 10

• 10m + 20

• 10m - 20

Marion is 3 years more than 5 times as old as Paula. If p represents Paula’s age, which expression represents Marion’s age?

• 3p + 5

• 3p - 5

• 5p + 3

• 5p - 3

Oscar bought n ride tickets at the carnival. Esther bought 4 times as many ride tickets as Oscar. Which expression represents the total number of ride tickets that Oscar and Esther bought?

• 4n + 4n

• 4n + n

• 4n

• n + 4

Samantha has 3 more than 4 times as many books as Deanna. If Deanna has d books, how many books does Samantha have?

• 3d + 4

• 3d - 4

• 4d + 3

• 4d - 3

Hilary bought a jacket that cost $10 more than double the price of the sweater she bought. The price of the sweater was s dollars. What was the cost of both items?

• 2s + 10 + s

• 10s + 2 + s

• 2s + 10 - s

• 10s + 2 - s