I need help with the question in the attached image.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.

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?