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Nesterboy [21]
3 years ago
14

Please explain why you got the answer

Mathematics
1 answer:
Bond [772]3 years ago
8 0
I believe it is  D as in XD Xd XD
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Answer:

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\bf \textit{perimeter of a rectangle}=p=side+side+side+side&#10;\\\\&#10;or\implies p=w+w+l+l\implies p=2w+2l&#10;\\\\&#10;p=2(w+l)\qquad &#10;\begin{cases}&#10;w=width\\&#10;l=length\\&#10;------\\&#10;p=48&#10;\end{cases}\implies 40=2(w+l)\\\\&#10;-----------------------------\\\\&#10;\textit{area of it}=A=w\cdot l\qquad \begin{cases}&#10;w=width\\&#10;l=length\\&#10;------\\&#10;A=40&#10;\end{cases}\implies 40=wl\\\\&#10;-----------------------------\\\\

\bf thus\qquad &#10;\begin{cases}&#10;40=2(w+l)\to \frac{40}{2}=w+l\to\frac{40}{2}-l=\boxed{w}&#10;\\\\&#10;40=wl\\&#10;--------------\\&#10;40=\left( \boxed{\frac{40}{2}-l} \right)\cdot l&#10;\end{cases}

solve for "l" to find its length
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Can you help me on question 17?!
fomenos

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x³+57

step by step explanation

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