Can someone explain how to solve this ?

If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details

Zahra runs a 500-meter race at a constant speed. which graph shows her distance from the finish line during the race?

V=x^4-y^4 pick three expressions that can represent the three dimensions of the prism (each in meters)