Name the maximum and minimum of the function

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

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

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex