Answer:
Well the answer is 20 if your ment ((-40) / 20) x (45-55)
Explanation:
You start with the parenthesis since there is more than one equation in the parentheses you see if one has multiplication r division and start with that one if they both did and they dont it would not matter but you solve -40 / 20 first, and you get -2 now we haft to do the last equation in parentheses 45 - 55 and that leaves you with -10 now you multiply those two answers we got (-2 and -10) Witch leaves you with the final answer of 20.