Utilities An electric utility company determines the monthly bill by charging 85.7 cents per kilowatt-hour (kWh) used plus a base charge of $19.35 per month. Thus, the monthly charge is given by the function
f(W) = 0.857W + 19.35 dollars
where W is the number of kilowatt-hours.
a. Find f(1000) and explain what it means.
b. What is the monthly charge if 1500 kWh are used?
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