4. If the perimeter of a rectangle with dimensions (2x + 10) and (x + 20) is 240 cm, find its dimensions.
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Answer:
50,70
Step-by-step explanation:
240=2[(2X+10)+(X+20)]
240=2[2X+10+X+20]
240=2[3X+30]
240=6X+60
180=6X
X=30
2X+10=2(30)+10=60+10=70
X+20=30+20=50
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