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September 2nd, 2015, 04:40 PM   #1
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Exclamation Electric company cost problem and explanation?

An electric company charges its customers a base rate of $10 a month plus 6 cents per kilowatt-hour(kWh) for the first 1200 kWh and 7 cents per kWh for all usage over 1200 kWh. Express the monthly cost E as a function of the amount of electricity used. Then graph the function E 0 =< x =< 2000.

I got this:

10(0.06 - x) if 0 =< x < 0.06
x { 0 if 0.06 =< x =< 0.07
10(x - 7) if x > 0.07

How do I graph it? I have no idea.
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September 2nd, 2015, 05:31 PM   #2
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Your formulas are completely wrong. I assume E is $ charged, and x is usage.

E=10+.06x, x<1200
E=82+.07x, x>1200
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