Answer: 
Step-by-step explanation:
We have the following function:

And we have to evaluate it when
, this means we have to substitute
by
:

Solving:

Finally:

The answer is 11 degrees if you want to know why this is the answer reply to my comment
Answer: 4(−a+1)(a−1)
Step-by-step explanation:
Division and subtraction because the quotient is the result of a division and 'less than is a subtraction.