Fill in the blanks. The energy usage of a light bulb is a function. The input for the function is _, measured in hours.

The output of the function is energy usage, measured in _.

Identify the functional relationship between the variables. _ is a function of _.
The graph of the function will show energy usage on the _ axis and time on the _ axis.

4.

Practice: Organizing Information (2 points)

Use the data given to complete the table for your first bulb.
DATA TABLE A
Time (hours)
x

Energy (kWh)
y

Point (time, energy)
(x, y)

3

10

5.

Practice: Organizing Information (2 points)

Use the data given to complete the table for your second bulb.
DATA TABLE B
Time (hours)
x

Energy (kWh)
y

Point (time, energy)
(x, y)

3

10

6.

Practice: Organizing Information (5 points: 1 point for labels, 2 points for each graph)

Label the axes of the graph with "Time (hours)" and "Energy (kWh)." Plot the points from table A on the graph. Connect the points with a line. On the same graph, plot the points from table B and connect them with a line.

7.

Practice: Summarizing (1 point)

Classify each of your graphs as increasing, decreasing, or constant.

First bulb: _

Second bulb:_

8.

Practice: Summarizing (2 points)

Fill in the blanks.

First bulb: When 3 is the input, the output is _. When 10 is the input, the output is _.

Second bulb: When 3 is the input, the output is _. When 10 is the input, the output is _.

9.

Practice: Summarizing (1 point)

The workers leave the lights on in the break room for stretches of about 3 hours. Which light bulb would light this room using the least amount of energy?

10.

Practice: Summarizing (1 point)

The lights in the main room of the factory stay on for stretches of 9 hours. Which kind of light bulb would light this room with the least amount of energy?