Question

Mike found the difference between 18 and a number, n. Which is the correct expression and difference if n = 6?

18 – n; when n = 6 the value is 12.
18 + n; when n = 6 the value is 24.
18 + n; when n = 6 the value is 12.
18 – n; when n = 6 the value is 24.

Answer 1

The correct answer is 18-n; when n=6 the value is 12.

Explanation:

18- (n=6) = 12

Answer 2

18-n: when n=6 the value is 12

Explanation:

You are looking for the difference so automatically b and c are out. 18-6 is 12 not 24.