Rewrite with only sin x and cos x. (1 point) sin 2x - cos 2x 2 sinx cosx - 1 + 2 sin2x 2 sin x cos2x - 1 + 2 sin2x 2 sin x cos2x - sin x + 1 - 2 sin2x 2 sin x cos2x - 1 - 2 sin2x

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

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

Find the value of x for which line a is parallel to line b