What should be done first to evaluate the expression?

6 + 8 ÷ 4 + (4 × 5)²

First, follow the first step in PEMDAS so you would do the parenthesis first followed by exponents, multiplication, division, addition, then subtraction

Step-by-step explanation:

6 + 8 ÷ 4 (4*5)^2

6 + 8 ÷ 4 + 20^2

6 + 8 ÷ 4 + 400

6 + 2 + 400

= 408

c is the answer

step-by-step explanation:

3xy cannot be combined with the others

2x, -5x and x are like terms