### Home > MC2 > Chapter 3 > Lesson 3.2.1 > Problem 3-63

3-63.

? + 1.2 = −1.8

List the factors of 12.

(1 and 12) (2 and 6) (3 and 4)

Since the product is a negative number, one missing number must be a negative and the other must be a positive. Which two numbers would make a difference of 4?

−8 + ? = −11

See part (b).