EMERGENCY PLSS SOMEONE HELP ME RN

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x, y) ?

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

You went to a restaurant and spent $53.25 on the meal. there was a 6% sales tax. what was the amount of money, not including a tip, you spent at the restaurant?