write this informatin in the form of an equation for d
2006-09-10 02:13:40 · 5 answers · asked by GRAHAM C 1 in Science & Mathematics ➔ Mathematics
2(d+d+40)=400
2(2d+40)=400
4d=400-80
4d=320
d=80
Checking: 80+80+120+120=400 OK
2006-09-10 02:33:11 · answer #1 · answered by albert 5 · 0⤊ 0⤋
Perimeter Formula
P = 2L + 2W
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Information from the above statement
w = Width
L = w + 40
400 = perimeter
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P = 2L + 2W
400 =2(w + 40) + 2w
400 = 2w + 80 + 2w
400 = 4w + 80
Gathering like terms
400 - 80 = 4w + 80 - 80
Subtracting - 80 from both sides of the equation
320 = 4w
Gathering like terms
320/4 = 4w/4
Dividing both sides of the equation by 4
80 = w
Insert the w value into the equation
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Solving for L
P = 2L + 2W
400 = 2L + 2(80)
400 = 2L + 160
400 - 160 = 2L + 160 - 160
Subtracting - 160 from both sides of the equation
240 = 2L
240/2 = 2L/2
Dividing both sides of the equation by 2
120 = L
Insert the L value into the equation
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P = 2L + 2W
400 = 2(120) + 2(80)
400 = 240 + 160
400 = 400
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The answer for lenght is 120 m
The answer of width is 80m
2006-09-10 10:04:47 · answer #2 · answered by SAMUEL D 7 · 0⤊ 0⤋
Well the length would be 120m and the width 80m.
2006-09-10 09:16:28 · answer #3 · answered by Anonymous · 0⤊ 0⤋
perimeter = d+d+w+w
400 = 2d + 80
320 = 2d
d = 160m
2006-09-10 09:29:06 · answer #4 · answered by Schorpe 2 · 0⤊ 0⤋
2(d+d-40)=400
2(2d-40)=400
d=120
2006-09-10 09:15:50 · answer #5 · answered by astrokid 4 · 1⤊ 0⤋