Lesson 20: Practice Problems

Problem 1

  1. A cube’s volume is 512 cubic units. What is the length of its edge?

  2. If a sphere fits snugly inside this cube, what is its volume?

  3. What fraction of the cube is taken up by the sphere? What percentage is this? Explain or show your reasoning.

Problem 2

Sphere A has radius 2 cm. Sphere B has radius 4 cm.

  1. Calculate the volume of each sphere.

  2. The radius of Sphere B is double that of Sphere A. How many times greater is the volume of B?

Problem 3 From Unit 5 Lesson 16

Three cones have a volume of cm³. Cone A has a radius of 2 cm. Cone B has a radius of 3 cm. Cone C has a radius of 4 cm. Find the height of each cone.

Problem 4 From Unit 5 Lesson 5

The graph represents the average price of regular gasoline in the United States in dollars as a function of the number of months after January 2014.

A graph of months after January 2014 vs average price of gas in dollars which starts at (0,3.3). The line rises and falls several times.

  1. How many months after January 2014 was the price of gas the greatest?

  2. Did the average price of gas ever get below $2?

  3. Describe what happened to the average price of gas in 2014.

Problem 5

Match the description of each sphere to its correct volume.

  1. Sphere A: radius of 4 cm

  2. Sphere B: diameter of 6 cm

  3. Sphere C: radius of 8 cm

  4. Sphere D: radius of 6 cm

  1. cm3

  2. cm3

  3. cm3

  4. cm3

Problem 6 From Unit 4 Lesson 15

While conducting an inventory in their bicycle shop, the owner noticed the number of bicycles is 2 fewer than 10 times the number of tricycles. They also know there are 410 wheels on all the bicycles and tricycles in the store. Write and solve a system of equations to find the number of bicycles in the store.