The cost of electricity in a certain city is $0.08 for each of the first 300kWh (kilowatt-hours) and $0.13 for each kilowatt-hour over 300kWh. Find the number of kilowatt-hours used by a family with a $51.95 electric bill.

Step-by-step explanation:

0.08*300 + 0.13x = 51.95

Multiply thru by 100 to get:

8*300 + 13x = 5195

13x = 5195-2400

13x = 2,795

x = 215 hours

515

Step-by-step explanation:

0.08×300 = 24

24 + 0.13(x-300) = 51.95

0.13(x-300) = 27.95

x-300 = 215

x = 515 kWhours

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b