Question

the formula for finding the area of a rectangle is A=LWSolve this formula for LL=______if the length of a rectangle is 18 feet qnd the width is 9 inches. what is the area of the rectangle in units of square feet? _______ ft^2

Answer 1

1) Dividing the given formula by W we get:

$\begin{gathered} \frac{A}{W}=\frac{LW}{W}, \\ \frac{A}{W}=L. \end{gathered}$

2) We know that:

$1in=\frac{1}{12}ft.$

Therefore:

$9in=9*\frac{1}{12}ft=\frac{3}{4}ft.$

Then:

$W=\frac{3}{4}ft.$

Substituting W=3/4ft and L=18ft in the given formula we get:

$A=(18ft)(\frac{3}{4}ft)=13.5ft^2$

Answer:

1)

$L=\frac{A}{W}.$

2)

$13.5ft^2.$