What is the answer to this?

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

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 25002500 grams and a standard deviation of 800800 grams while babies born after a gestation period of 40 weeks have a mean weight of 27002700 grams and a standard deviation of 385385 grams. if a 3232-week gestation period baby weighs 21252125 grams and a 4040-week gestation period baby weighs 23252325 grams, find the corresponding z-scores. which baby weighs lessless relative to the gestation period?