Westside Energy charges its electric customers a base rate of $3.00 per month, plus 15¢ per kilowatt-hour (kWh) for the first 300 kWh used, and 12¢ per kWh for all usage over 300 kWh. Suppose a customer uses x kWh of electricity in one month.

(a) Express the monthly cost E (in dollars) as a function of x.

E(x) =

?????? if 0 ≤ x ≤ 300
?????? if 300

Question

Westside Energy charges its electric customers a base rate of $3.00 per month, plus 15¢ per kilowatt-hour (kWh) for the first 300 kWh used, and 12¢ per kWh for all usage over 300 kWh. Suppose a customer uses x kWh of electricity in one month.

(a) Express the monthly cost E (in dollars) as a function of x.

E(x) = 

?????? if 0 ≤ x ≤ 300
?????? if 300 < x

anonymous · Answer

i need help with 300<x

for if 0 ≤ x ≤ 300    i found 3+.15x