Hey besties pls help loll

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

Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9

Aclothing designer is selecting models to walk the runway for her fashion show. the clothes she designed require each model’s height to be no more than y inches from 5 feet 10 inches, or 70 inches. which graph could be used to determine the possible variance levels that would result in an acceptable height, x?