CPM Homework Help : MC2 Problem 3-38

Sketch the algebra tile shape below on your paper. Write an expression for the perimeter of the shape, then find the perimeter for each of the given values of $x$ .

Hint:

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

Expression:

$P = 4x + 4$

$x = 7$ units
Hint (a):
Substitute $7$ for $x$ in the expression of the perimeter.
Help (a):
Evaluate the expression.
$4(7) + 4 = ?$
Answer (a):
$32$ units.

$x = 5.5$ units
Hint (b):
Substitute $5.5$ for $x$ in the expression of the perimeter.
More Help (b):
Evaluate the expression.
Answer (b):
$26$ units.

$x = \frac { 7 } { 3 }$ units
Hint (c):
See parts (a) or (b).