How can you know which is the height and the base of a prism

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Fa bus driver leaves her first stop by 7: 00 a.m., her route will take less than 37 minutes. if she leaves after 7: 00 a.m., she estimates that the same route will take no less than 42 minutes. which inequality represents the time it takes to drive the route, r?