What is the area answer fast

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

A(1,1) b(-3,0) c(-4,-1) d(3,-2) drag it to correct position

Aline has a slope of . which ordered pairs could be points on a parallel line? check all that apply. (-8, 8) and (2, 2) (-5, -1) and (0, 2) (-3, 6) and (6, -9) (-2, 1) and (3,-2) (0, 2) and (5,5)