1. choose the property that justifies the following conclusion.
if ac = ab + bc and ab + bc = 13, then ac = 13.
o symmetric property
transitive property
reflexive property
additive property of equality

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.