You earn $3 an hour as a waitress. after working 3 hours, you earn $12, $5, and $7 in tips. how much money did you earn in total? explain how you found your answer.

$33 Because if she works three hours and each hours she gets three dollars the that is 9 dollars plus 12 5 and 7 equals 33

Iam thinking the answer is a.) knew

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.