01-11-2016
Mathematics

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50 (20-x) + 40x ≤ 300.
When x ≥ b.
Find b.
Thank you for your help!

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kaoook12 kaoook12

01-11-2016

50(20-x) + 40x < 300
1000-50x+40x<300
1000-10x<300
-10x<300-1000
-10x<-700
multiply by -1
10x>700
x>70
b=0-70

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