Question

a hallway has an area of 63 square feet the length of the hallway is 7 times longer then the width what is the length of the hallway?

Answer 1

You have a hallway, can you imagine it? It looks like a rectangle. The formula for the area of a rectangle is \[a=bh\]
Let w= width
your length would be 7w
(7w)(w)=63
\[7w ^{2}=63\]
Divide by 7 on both sides
w^2=9
w=3
So since the width is 3 then the length would be 7 times the width so your length=21
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