### Home > MC2 > Chapter 3 > Lesson 3.1.4 > Problem 3-38

3-38.

Find the perimeter as you did in problems 3-29 and 3-20, including *x* as part of the expression.

*P* = 4*x* + 4

Substitute 7 for *x* in the expression of the perimeter.

Evaluate the expression.

4(7) + 4 = ?

32 units.

Substitute 5.5 for *x* in the expression of the perimeter.

Evaluate the expression.

26 units.

See parts (a) or (b).