4. Use Formula An equation that involves several variables is called a formula or literal equation. To solve a literal equation, apply the process of solving for a specific variable. The formula for the circumference of a circle is 𝐶=2𝜋𝑟, where 𝐶 represents circumference and 𝑟 represents the radius.

5. The formula for the volume of a rectangular prism is 𝑉=𝑙𝑤ℎ, where 𝑙 is the length, 𝑤 is the width, and ℎ is the height.

6. A soap company wants to use a cylindrical container to hold their new liquid soap.