Question

What number must be added to the expression (-75) - (-20) so that the sum is is 56?

A) 151
B) -151
C) -111
D) 111

Answer 1

Two negatives make a positive.

-75 - (-20) = -75 + 20

Do the math now:

-75 + 20 = -55

Write down the final equation to get the answer, which is finding the difference between 56 and -55:

Two negatives again...they make a positive, so re-write the equation:

56 - (-55) = 56 + 55

Get the answer by solving:

56 + 55 = 111

Explanation:

Answer 2

D) 111

Explanation:

(-75) - (-20) +x = 56

A negative minus a negative means add

-75 + 20 +x =56

-55 +x = 56

Add 55 to both sides

-55+55 +x = 56+55

x = 111