Answer:
and 
Step-by-step explanation:
Recall that
is a value of the function cosine for the special angles:
and
, then:

Yes indeed it is. Your correct
Answer:
ummm i dont know but try 16 35/21
Step-by-step explanation:
3/4 or 0.75 or just 75%. doesn't get much simpler
The answer to your question is w =40(2)n [n is in exponent form I just couldn’t type it that way ]