Answer:

Step-by-step explanation:
we know that

therefore
The expression in the form
is equal to

where
k=16
n=2
The answer is D because when you insert it into a calculator it gives you D. Yet, if you do it manually you still get the same number .
If you don't know the value of 'a', we can only simplify.
4a - 11a = -7a
We combine since they are like terms.
Answers:
3. 5x-y=-3
4. x-2y=16
Hope this helps!
The answer is 10, by using pemdas you can just either add, subtract, multiply or divide.
10