ANSWER
C. 7
EXPLANATION
We want to evaluate

We use the order of operations PEDMAS.
Dealing with the parenthesis first,we have

Note that:

and

Our expression now becomes:

Next, we add to get:

We finally subtract to get,

The correct answer is C
The answer is 16. 1^2 is 1, 2^2 is 4, 3^2 is 9, and 4^2 would be 16.
Answer:
x = 8 and y=9 or y = 8 and x = 9
Step-by-step explanation:
8 x 9 = 72
8+9 = 17
9 x 8 = 72
9+8 = 17