Question

Evaluate:
a = -3, b = 1, and c= -4
-21-c

Answer 1

-17

Explanation:

- 21 - c

Put c as -4.

- 21 - (-4)

The negative signs cancel.

- 21 + 4

Add both the terms.

= -17

Answer 2

-17

Explanation:

-21-c

Let c = -4

-21 - -4

Subtracting a negative is like adding

-21 +4

-17