3 years ago

The surface area of a swimming pool is 210 square feet. What is the length d of the deep end (in feet)?

1 answer:

8 0

$\bf \textit{area of a rectangle}\\\\
A=Lw~~
\begin{cases}
L=length\\
w=width\\[-0.5em]
\hrulefill\\
A=210\\
w=10\\
L=d+9
\end{cases}\implies 210=(d+9)(10)\implies \cfrac{210}{10}=d+9
\\\\\\
21=d+9\implies 12=d$

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