Question

What is the value of the variable that makes the statement true? c + (–8) + (–5) = 0
a. –13
b. –3
c. 3
d. 13

Answer 1

c + (-8) + (-5) = 0
c - 8 - 5 = 0
c -13 = 0   (add 13 to each side)
  +13    +13  
   c = 13

The answer is D.

Answer 2

(-8) + (-5)= -13 so plug in -13 for variable c and you get -13+ -13= 0