Dependent and Independent Variables Pretest

• 72 mph

• 54.3 mph

• 69.6 mph

• 62 mph

Paulina is driving 45 miles per hour. Which equation gives the distance d she travels after h hours?

• d=45h

• d=h÷45

• d=h+45

• d=h-45

To convert a distance between miles and feet, you can use the equation f = 5280m, where f represents the number of feet and m represents the number of miles. In this equation, which describes the role of f ?

• the dependent variable

• the independent variable

• the dependent quantity

• the independent quantity

Roy is hiking down a mountain at a rate of 3 miles per hour. He started at the top of the mountain on a 12.5-mile trail to his tent camp. Which is the dependent variable in this problem situation?

• time

• distance

• altitude

• speed

The cost of a small cup of coffee at a deli is $3.50. You can use the equation t = 3.5n, where t represents the total money made from the sale of small coffees and n is the number of cups of small coffees sold. In this equation, which describes the role of n?

• the dependent variable

• the independent variable

• the dependent quantity

• the dependent quantity

Alex is hiking a mountain trail. Which description best matches what is shown on the graph?

• Alex hiked steadily for the first 50 minutes, and then took a rest.

• Alex hiked steadily up the trail for 60 minutes, and then he hiked back.

• Alex hiked at one pace for 60 minutes, then he decreased his pace for the remainder.

• Alex hike slowly for 60 minutes, then he increased his pace for the remainder.

Which situation could best be represented by the graph?

• Felicia ran to the bus stop and waited for the bus.

• George rode his bike to the library, got a book, and then rode back home.

• Laura climbed up the rock wall and climbed right back down again.

• Carl waited at school for his ride home.

Stef is launching her model rocket from a 10-foot platform. On her first launch, the rocket sputtered, flew up about 10 feet, and fell to the ground. Which graph best represents this situation?

• 
• 
• 
• 

Sonja is running laps on the track. Which description best matches what is shown on the graph?

• Sonja's running slowly decreased for the first 3 minutes, and then her running increased quickly.

• Sonja's running slowly increased for the first 3 minutes, and then her running increased quickly.

• Sonja slowly increased speed the entire time she ran laps.

• Sonja slowly decreased speed the entire time she ran laps.

If you jog at an average rate of 6.5 miles per hour, which equation expresses the relationship between your jogging time and your distance?