Respuesta :

twvogels
Call the length [tex]l[/tex] and the width [tex]w[/tex] 

We are told:
1. "The length of a rectangle is 3 times its width." i.e.: [tex]l=3w[/tex]
2. "The rectangle’s width is 4 m." i.e.: [tex]w=4[/tex]

So, by substitution we have:
[tex]l=3w[/tex]
[tex]l=3(4)[/tex]
[tex]l=12m[/tex]

Then we can use our area formula:
[tex]A=lw[/tex]
[tex]A=(12m)(4m)[/tex]
[tex]Area=48m^{2}[/tex]
BlackArroe

Answer:

48m²

Step-by-step explanation:

L= 3*4

W= 4

Area= L*W

A=(3*4)*4

A=12*4

A=48

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