What are the factors of x2 – 100?
TOPB
(X - 50)(X + 50)
(x - 10x + 10)
(X - 25)(x + 4)
(X - 5)(x + 20)

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.