Phone Plans and Streaming Costs

Substitute values and use the order of operations to evaluate each formula.

Substitute and Evaluate

All costs are in dollars. Substitute the given value, then follow the order of operations. The formulas include all charges.

A streaming app's monthly cost is 8 + 2n, where n is the number of movie rentals. Evaluate the expression for n = 6.

Monthly cost: dollars

A phone plan's extra-data charge is 3p + 5, where p is the number of extra data packs. What is the charge when p = 4?

A. 27 dollarsB. 17 dollarsC. 12 dollarsD. 24 dollars

A phone account's remaining credit is 30 − 2(x + 3), where x is the number of paid add-ons used. Evaluate the expression when x = 5.

Remaining credit: dollars

A streaming app tests a pricing formula of 6 + n² dollars, where n is the selected service tier. What is the cost at tier n = 3?

A. 12 dollarsB. 81 dollarsC. 18 dollarsD. 15 dollars

Four family members split a phone charge equally. Each person's share is (p + 12) ÷ 4 dollars, where p is the base charge. Find each person's share when p = 20.

Each person's share: dollars

Apply Usage Formulas

Use each formula exactly as written. Keep parentheses when substituting.

A phone plan costs 12 + 1.5x dollars per month, where x is the number of gigabytes used. Noor uses 8 gigabytes. Find the monthly cost.

Monthly cost: dollars

A streaming plan includes four downloads. For n ≥ 4 downloads, its monthly cost is 5 + 0.5(n − 4) dollars. Mateo downloads 10 videos. Find his cost.

Monthly cost: dollars

An audio streaming app charges 4 + (3/4)n dollars, where n is the number of premium episodes purchased. Imani purchases 12 premium episodes. Find her total charge.

Total charge: dollars

Three friends share a streaming subscription. Each friend's cost is (p + 6) ÷ 3 dollars, where p is the subscription price before a shared upgrade. If p = 21, how much does each friend pay?

A. 9 dollarsB. 13 dollarsC. 7 dollarsD. 27 dollars

10.

A streaming app charges 7 + 2n dollars per month, where n is the number of rentals. Evaluate the formula for each usage level in the table.

Monthly Streaming Charges
Rentals (n)	Cost (dollars)
2	?
4	?
7	?

Cost for 2 rentals: dollars
Cost for 4 rentals: dollars
Cost for 7 rentals: dollars

Compare and Check

Evaluate before making a decision. Show your reasoning for the final question.

11.

Phone Plan A costs 10 + 2x dollars, and Phone Plan B costs 16 + x dollars. In both formulas, x is the number of gigabytes used. Which statement is correct for x = 8?

A. Plan A costs 2 dollars less than Plan B.B. Both plans cost 24 dollars.C. Plan B costs 2 dollars less than Plan A.D. Plan B costs 6 dollars less than Plan A.

12.

A streaming bundle costs 5 + 3n dollars per month, where n is the number of add-on channels. Priya has a monthly limit of 18 dollars and wants 4 add-on channels. Which statement is correct?

A. The bundle costs 20 dollars, so it is 2 dollars over her limit.B. The bundle costs 17 dollars, so it is 1 dollar below her limit.C. The bundle costs 12 dollars, so it is 6 dollars below her limit.D. The bundle costs 32 dollars, so it is 14 dollars over her limit.

13.

Eli sets aside 40 dollars for streaming. After paying for a plan and rentals, the money left is 40 − (9 + 2n) dollars, where n is the number of rentals. How much is left after 7 rentals?

Money left: dollars

14.

A streaming service tests the cost formula 6 + 3n² dollars, where n is the selected service tier. For n = 4, Sam writes: 6 + 3 × 4² = 6 + 12² = 150. Identify Sam's mistake and explain how to find the correct cost.