How do you simplify #40 + 40 * 0 + 1#?
You can use PEMDAS to help you simplify this expression.
Since you're not dealing with parantheses or exponents, you need to focus on the MDAS part of PEMDAS.
In other words, MD, multiplication and division, come before AS, addition and subtraction.
This means that you need to do the multiplication first, then add the remaining terms
#40 + underbrace(40 * 0)_(color(blue)("multiplication")) + 1#
#underbrace(40 + 0 + 1)_(color(orange)("additions")) = color(green)(41)#