jacklynv
jacklynv jacklynv
  • 15-08-2017
  • Mathematics
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twvogels
twvogels twvogels
  • 15-08-2017
x+y=70
x-y=30
x=30+y
30+y+y=70
2y=40
y=20
x+20=70
x=50
xy=(50)(20)=1000
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