### Home > CCAA > Chapter 4 Unit 3 > Lesson CC2: 4.2.3 > Problem 4-53

4-53.

Simplify the following expressions.

You must find a common denominator before you can combine these terms.

A common denominator is often a multiple of both denominators of the fractions that are to be combined.

A good one to use for this expression would be.

Refer to part (a).