Question

1. use the table. what is the total amount of electricity a computer, a television, and a heater use in 1 hour? show your work.
2. how many hours does it take for a light bulb to use as much electricity as a heater uses in 1 hour?

Explanation:

Step1: Calculate total electricity for question 14

Add electricity used by computer ($0.09$), television ($0.3$), and heater ($1.5$) per hour.
$$0.09 + 0.3+1.5$$
$$=0.39 + 1.5$$
$$=1.89$$

Step2: Calculate hours for question 15

Let $t$ be the time. Heater uses $1.5$ kWh per hour, bulb uses $0.1$ kWh per hour. Set up equation $1.5\times1 = 0.1\times t$. Solve for $t$:
$$t=\frac{1.5\times1}{0.1}$$
$$t = 15$$

Answer:

1. $1.89$ kilowatts.
2. $15$ hours.