That depends what the value of A is.
It is 20.
It is minus 20.
m^4 n^5 - m^20 n^21
(-11) x (-10) + (-20) 110 + (-20) 90
2 times a number minus 17 plus 20 times a number minus 9 is the same as 2x - 17 + 20x - 9 = 22x - 26
20-12*6=52
36 - 16 = 20
120 x 20 - 40 = 2360
20 - (8 x 2) = 4
185 x 20 - 5 = 3695
The answer is -20 (minus 20)
I advise that you ask us about each problem one at a time. Tell us the problem and we will see if we can simplify it for you.