An electric company charges $7.50 per month plus $0.09 for each kilowatt hour (kwh) of electricity used.
Use C as the total cost and n as the number of kwh. Write an expression that gives the total cost of n kwh of electricity.
C=7.50+0.09n
You can find the average cost per kwh by dividing total cost by number of kwh. Write the expression that gives the average cost per kwh.
C(kwh)=C/n
Find the average cost per kwh for 10 kwh, 100 kwh, and 1,000 kwh.
10 kwh You would first start by finding the overall cost
C=7.50+0.09(10)
C=7.50+0.90
C=0.84 kwh
Next plug in 0.84 for C and 10 for n.

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