Chapter 11, Lessons 1 and 2

The Tanner family is choosing a cell phone plan. Plan Premium costs $35 a month and includes 450 minutes. The charge for each minute over 450 is $0.16. The same company also offer a Plan Super Premium that offers un unlimited calling plan with a $55 monthly charge. At how many minutes would the cost of the two plans be the same?

• 575

• 566

• 552

• 545

Your neighbor’s air conditioner stopped working, so he decided to buy a new energy efficient air conditioner. The old model used 15 kWh of energy and his current electric costs are $0.1233/kWh. The new model uses 11 kWh of energy for the same level of cooling. Your neighbor ponders he will use the air conditioner 4 hours per day, on average. If the new air conditioner costs $5,000, how long will it take for the energy costs to pay for the new model?

• 3 years

• 5 years

• 7 years

• 9 years

Kayla’s last water bill listed a previous reading of 6,321 ccf and a present reading of 6,711 ccf. Her water company charges $0.68 per ccf of water. What should Emily have been charged on her water bill?

• 390

• 265.20

• 300

• 258.40

Last summer, Jane was charged $853.75 for 8,351 kWh of electricity. What did her company charge per kilowatt-hour of electricity?

• $0.25

• $0.20

• $0.15

• $0.10

Erin’s cell phone plan includes 4GB of data. On the 21st day of her billing period, Erin received a message from her service provider that she had already used 75% of her data allowance for the 30-day billing period. At this rate, will she use more than 4GB of data for the month?

• Yes, because 0.7 < 75%

• No, because 75% < 0.7.

A pay phone at a shopping mall charges $0.78 for the first 5 minutes and $0.23 for each extra minute (or part of a minute). Find the cost of a 15 - minute call on this phone.

• $2.30

• $3.00

• $3.08

• $2.95

A pay phone at a shopping mall charges $0.78 for the first 5 minutes and $0.23 for each extra minute (or part of a minute). Find the cost of a 12.5 - minute call on this phone.

• $2.62

• $2.24

• $1.95

• $1.84

Riley purchased a 30-day international cell phone plan for use during winter break. There is a one-time fee of $35 and it includes 150 MB of data usage. Each extra megabyte, or part thereof, of data costs $0.28. Find the cost of the plan if he uses 388 MB of data during the trip.

• $42

• $108.64

• $101.64

• $66