Lesson 12: Practice Problems
Problem 1
Describe a situation where each of the following quantities might be useful.
-20 gallons per hour
-10 feet per minute
-0.1 kilograms per second
Problem 2
A submarine is only allowed to change its depth by rising toward the surface in 60-meter stages. It starts off at -340 meters.
At what depth is it after:
1 stage
2 stages
4 stages
How many stages will it take to return to the surface?
Problem 3
Some boats were traveling up and down a river. A satellite recorded the movements of several boats.
A motor boat traveled -3.4 miles per hour for 0.75 hours. How far did it go?
A tugboat traveled -1.5 miles in 0.3 hours. What was its velocity?
What do you think that negative distances and velocities could mean in this situation?
Problem 4 From Unit 4 Lesson 3
A cookie recipe uses 3 cups of flour to make 15 cookies. How many cookies can you make with this recipe with 4 cups of flour? (Assume you have enough of the other ingredients.)
A teacher uses 36 centimeters of tape to hang up 9 student projects. At that rate, how much tape would the teacher need to hang up 10 student projects?
Problem 5 From Unit 5 Lesson 11
Evaluate each expression. When the answer is not a whole number, write your answer as a fraction.