Ap calculus need help please

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

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

Select all the statements that apply to this figure