Answers

2015-12-02T18:45:34+08:00
P= 2W + 2L = 1040
let x=width
3x-120=length

2(3x-120)+2x=1040
6x-240+2x=1040
8x-240=1040
8x-240+240=1040+240
8x=1280
8x÷8=1280÷8
x=160 - width
3(160)-120=360 - length


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