Page 134 - Algebra 1

12. Write Describe the plane’s flight in the first and last hour of the trip.
13. Write Explain why the graph of the plane’s flight is relatively flat
between 2 and 4 hours of the flight.
Investigation Practice
Graph each situation. Indicate whether the graph is continuous or discrete. Then describe the graph as increasing, no change, and/or decreasing.
a. Boxes of greeting cards sell for $5 a box. Income is calculated based on the number of boxes sold.
b. A scuba diver dives to a depth of 100 feet below sea level, then spends some time exploring the aquatic life at that level. The diver then descends to 250 feet below sea level for the remainder of the dive. (Hint: Assume the diver descends about 100 ft per 5 minutes.)
c. A driver brakes as she approaches an intersection. She stops to watch for traffic and pedestrians. The driver continues when the way is clear.
d. Multiple Choice The temperature of an ice cube increases until it starts to melt. While it melts, its temperature stays constant. Which graph best represents the situation?
ABC
Time Time Time
Describe the shape of the graph representing each situation.
e. Write A rocket is launched into orbit and, in time, returns to Earth. The
graph relates time to the rocket’s distance from Earth.
f. Write The ink in a printer is used until the ink cartridge is empty. The
graph relates time used to the amount of ink in the cartridge.
g. Write An employee of a delivery service earns $3 for every package she
delivers. The graph shows the employee’s total earnings based on the number of packages delivered.
Investigation 2 119
Temperature
Temperature
Temperature