Answer:
100
Explanation:
You have to use the order of operation (PEMDAS) Paranthesis, Exponents, Multiplication, Division, Addtion, and Subtraction to solve this problem.
First, multiply 5 and 4 to get 20 since it's between paranthesis and get
40-(-40)+20
Then, add 40 and 40 as two negatives becomes a positive. You should get
80+20
Finally, add 20 to 80 and get 100!