Does anyone know the answer to number 9

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

What is the measure of the smallest angle in the diagram? 15 29 32 45

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b.you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c.you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d.you spend $5 plus $10 per week until you have less than $45.