What is the value of the expression [(29+18)+(17-8)] divided by 8

In the pendulum formula t=2pi. read the problem on the picture ! ; $; $; ! ; ! ; ! ; )$; ! ; ! ; ! ; $; $; $! ; ! ; ); $; $$

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

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