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Tristan and his friends made a banner for their back-to-school dance. The banner is rectangular, and it is $15$ feet wide and $5$ feet tall. $\newline$ Which equation can you use to find the banner's area, $A$ ? $\newline$ Choices: $\newline$ (A) $A = 15 \times 5$ $\newline$ (B) $15 = 5 \times A$ $\newline$ What is the area of the banner? $\newline$ Write your answer as a whole number or decimal. Do not round. $\newline$ ____ square feet

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Area of quadrilaterals and triangles: word problems

Full solution

Q. Tristan and his friends made a banner for their back-to-school dance. The banner is rectangular, and it is

15

feet wide and

5

feet tall.

\newline

Which equation can you use to find the banner's area,

A

?

\newline

Choices:

\newline

(A)

A = 15 \times 5

\newline

(B)

15 = 5 \times A

\newline

What is the area of the banner?

\newline

Write your answer as a whole number or decimal. Do not round.

\newline

____ square feet

Multiply dimensions: To find the area of a rectangle, we need to multiply the width by the height. The formula for the area, $A$ , of a rectangle is $A = \text{width} \times \text{height}$ .
Substitute into formula: Substitute the given dimensions into the formula: $A = 15 \, \text{feet} \times 5 \, \text{feet}$ .
Perform multiplication: Perform the multiplication: $15 \times 5 = 75$ .

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