The cost to produce x candles is given by c(x)=100+0.9x. find c(x+1)-c(x)
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c(44)=180+9*44=219.6
c(45)=180+9*45=220.5
220.5-219.6=0.9
diff (180+9*x,x)=0.9
c(45)=180+9*45=220.5
220.5-219.6=0.9
diff (180+9*x,x)=0.9
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