4.4.4 Writing a Rule Using Function Notation

Algebra 14.4.4 Writing a Rule Using Function Notation

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4.4.4 • Writing a Rule Using Function Notation

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Complete the table with the perimeter of a square for each given side length.

side length (inches)	perimeter (inches)
0.5	a. ______
7	b. ______
20	c. ______

a. ______

b. ______

c. ______

a. 2

b. 28

c. 80

Write a rule for a function, $P$ , that gives the perimeter of a square in inches when the side length is $x$ inches.

Compare your answer:

$P (x) = 4 x$

What is the value of $P (9.1)$ ? What does it tell us about the side length and perimeter of the square?

Compare your answers:

$P (9.1) = 36.4$ . It tells us that when the side length of the square is 9.1 inches, the perimeter of the square is 36.4 inches.

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