Solve using the addition principle.
-s - 7 = 13
A)6
B)-20
C)20
D)-6

Question

Quizplus · Accepted Answer

To solve using the addition principle, we want to isolate the variable (s) on one side of the equation by adding the same number to both sides. 
s - 7 + 7 = 13 + 7 
s = 20 
Therefore, the answer is C)20. To solve using the addition principle, we need to isolate the variable s on one side of the equation by adding 7 to both sides:

s - 7 + 7 = 13 + 7

s = 20

Therefore, the answer is choice C, which is 20.

Solve Using the Addition Principle