You walk 20 meters north, then 5 meters south. what is your displacement?
a. 15 meters
b. 25 meters
c. 15 meters north
d. 25 meters north

Sry this is completely off topic, but where do you go to ask questions? I can't seem to find it. The answer is C I think

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.