CPM Homework Help : MC2 Problem 3-29

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3-29.

Find the perimeter of each figure made of algebra tiles below.

Hint (a):
Refer to the solutions for 3-20 or the Math Notes box of Lesson 3.1.3.
More Help (a):
Remember, the tiny square represents a unit piece, which is a $1 × 1$ square.
Labels (a):
Answer (a):
$4x + 4$

Hint (b):
Refer to the solutions for 3-20 or the Math Notes box of Lesson 3.1.3.
More Help (b):
Since part of the side with length $x$ touches the unit square, the side that is included in the calculation of the perimeter is $x −1$ .
Help (b):

Do you understand why the length of one side is labeled
$x -1$ ?

Hint (c):
Refer to the solutions for 3-20 or the Math Notes box of Lesson 3.1.3.

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