5 Which expression is equivalent to 4 (2p+49)?
A 4p + 169
B 8p + 49
2p + (3p + 169)
D) None of the above

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.