Find the product mentally. (r - s)2 2 r2 - rs - s2 r2 - rs s2 r2 - 2 rs s2.

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.

The percent increase is 25%