-2m-9 is the simplified expression
I think this is the answer !

Then using trygonometric table or a graph we read that:

Period of cosinus function = 2π
So the last answer is
Answer:
9 books
Step-by-step explanation: 10- 1 = 9. Take away is subtract
Answer:
D) 33
Step-by-step explanation:
64 - [(9 ÷ 3) + 4 x 7]
64 - [3 + 4 x 7]
64 - [ 3 + 28]
64 - 28 = 33