Modeling Real-Life Costs with Functions for Grade 8

A car rental company charges a flat fee of $50 plus $0.20 per mile driven. Write a function to represent the total cost, C, as a function of miles driven, m. How much would it cost to drive 150 miles?

• $100

• $60

• $80

• $120

A gym charges a monthly membership fee of $30 plus $10 for each class attended. If you attend x classes in a month, write a function for the total cost, T. How much would you pay if you attend 5 classes?

• $60

• $80

• $100

• $50

A phone plan costs $25 per month plus $0.10 for each text message sent. Write a function to represent the total cost, C, based on the number of text messages, t. What is the total cost if you send 200 messages?

• $60

• $30

• 45

• $50

A bakery sells cupcakes for $3 each and charges a $5 box fee. Write a function for the total cost, C, of buying x cupcakes. How much would it cost to buy 12 cupcakes?

• 50

• 41

• 25

• 30

A landscaping service charges a flat fee of $100 plus $15 per hour of work. Write a function to represent the total cost, C, based on hours worked, h. What is the total cost for 4 hours of work?

• 160

• 120

• 140

• 180

A subscription service charges $10 per month plus $2 for each movie rented. Write a function for the total cost, C, based on the number of movies rented, m. How much would you pay if you rent 8 movies?

• 22

• 26

• 34

• 18

A concert ticket costs $50 plus a $5 service fee. Write a function to represent the total cost, C, of buying t tickets. How much would it cost to buy 3 tickets?

• $160

• $155

• $145

• $150

A delivery service charges a base fee of $15 plus $0.50 per mile. Write a function for the total cost, C, based on the distance in miles, d. What is the total cost for a delivery of 10 miles?

• $15

• $30

• $20

• $25

A school charges a $200 registration fee plus $50 per class. Write a function for the total cost, C, based on the number of classes, c. How much would it cost to register for 4 classes?

• 250

• 400

• 300

• 350

A streaming service charges $12 per month plus $1 for each additional user. Write a function for the total cost, C, based on the number of additional users, u. What is the total cost if you have 3 additional users?

• 20

• 10

• 25

• 15