Because you have to go in the order of PEMDAS, parenthesis, exponents, multiplication, division, addition, and subtraction. From what you are saying, 'why you must simplify 3 to the second power first' it seems that you have no parenthesis, so you move onto what is next, which is exponents, in this case, 3 to the power of two.
Five hundred and sixty two divided by seven would be,
=80.28
18.90? I believe would be the answer . Let's see if someone else responds
Answer:
B
Step-by-step explanation: