### Home > MC2 > Chapter 3 > Lesson 3.1.3 > Problem 3-30

3-30.

Visualize a number line. Move your point 6 spaces to the right, and then 18 spaces to the left. Where is your point now located?

−12

Find the difference between 25 and 12. The sign (positive or negative) of the solution is that of the larger number.

−13

Since both numbers have the same sign, add them together. The solution will have that sign (positive or negative).

See parts (a) or (b).