10.1 Utility Expenses

Expenses for electricity, natural gas, heating oil, and water.

• mean

• price

• utility

• income

Electricity is sold by the:

• cubic foot

• watt

• kilowatt-hour

• watt-hour

ccf is measured by:

• 1000 cubic. ft.

• 10 cubic ft.

• 10,000 cubic ft.

• 100 cubic ft.

Emily's last water bill listed a previous reading of 7,123 ccf and a present reading of 7,171 ccf. Her water company. charges $0.73 per ccf of water. What should Emily have been charged on her last water bill?

• $36.99

• $35.04

• $48

• $36.04

Home heating oil is sold by the gallon. Last winter, the Romano family used 370 gallons of oil at a price of $3.91 per gallon. If the price increases 9% next year, what will their approximate heating expense be? Round to the nearest ten dollars.

• $1,580

• $1,446.70

• $1,450

• $1,446

Craig’s June water bill listed two meter readings. The previous reading was 6,372 ccf and

the present reading is 6,501 ccf. How much water did Craig’s household use during the

billing period?

• 129 ccf

• 127 ccf

• 130 ccf

• 140 ccf

The Ricardo household used w cubic feet of water during a summer month. Express the

number of ccf of water they used algebraically.

• 100w

• w x 100

• w/100

• 100/w

A certain guitar amplifier requires 200 watts when it is being used. How much would it

cost to run for 55 minutes, at a cost of $0.11 per kWh? Round to the nearest cent.

• $0.02

• $1.02

• $0.03

• $0.01

The PA system at High Point HS requires 400 watts when it is switched on. How much would it cost to run for 3 hours, at a cost of $0.10 per kilowatt-hour?

• $0.13

• $0.12

• $0.15

• $1.02

Last year, the Lawson family spent $1,882.56 for electricity. They are opting to use balanced billing for the next year. What will their monthly payment be under balanced billing?

• $160

• $157

• $156.88

• $165.88