Question 46908
c = 0.07w + 13.3
c = 0.07w + 13.3 [Plug-in x=375 and solve for "c"]
c = 0.07(375)
c=39.55
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Check by plugging (c=39.55) back into the original equation and solve for "w"
c = 0.07w + 13.3
39.55 = 0.07w + 13.3
39.55 -13.33 = 0.07w + 13.3 - 13.33
26.22/.07=.07w/.07
374.57=w [Round off to 375]
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For one wignut, plug-in x=1 and solve for "c":
c = 0.07w + 13.3
c = 0.07(1) + 13.3
c = 0.07(1) + 13.3
c=13.37
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Checking: 
13.37=0.07(1) + 13.3
13.37=13.37 [Checks out]


w + 13.3
. find the cost when 375 wing nuts are made.  what is the average cost to manufacture one wing nut?