The area of a cross-section of a plastic prism is 35cm^2 its length is 15cm the plastic has a density of 3.9/cm^3 what is the mass of the prism?

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.