45 1/2 as a fraction in its simplest form

Use the graph of the sine function y=2sinθ shown below

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

One of the complementary angles is 4 degrees mor than the other. find the angles (recall that complementary angles are angles whose sum is 90 degrees.) which of the following can not be used to solve the problem if x represents one of the angles? a. 2x-4=90 b. 2x+4=90 c. x+4=90