Let f(7)=12 and g(2)=7 what is the value of (f•g)(2)

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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

Can someone me with this? i’m not sure what to put for my equations.