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  3. westside energy charges its electric customers a b

Westside Energy charges its electric customers a base rate of $4.00 per month, plus 12¢ per...

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Question

Basic Math

Westside Energy charges its electric customers a base rate of$4.00 per month, plus 12¢ per kilowatt-hour (kWh) for the first 300kWh used and 3¢ per kWh for all usage over 300 kWh. Suppose acustomer uses x kWh of electricity in one month.

(a) Express the monthly cost E as a piecewise definedfunction of x. (Assume E is measured indollars.)

E(x) =

A.  if 0 ? x ? 300

B.  if 300 < x

C. (b) Graph the function E for 0 ? x ? 600.

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