### Home > CC1 > Chapter Ch6 > Lesson 6.2.5 > Problem 6-115

6-115.

Sketch the algebra-tile shape at right on your paper. Write an expression for the perimeter of the shape. Then find the perimeter for each of the given values of *x*. Homework Help ✎

Find the perimeter as you did in problems 6-96 and 6-106, 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 and evaluate.26 units

See part (a) or (b).