A utility company charges $0.12 per kilowatt-hour for energy a customer uses. They give a credit of $0.0025 for every kilowatt-hour of electricity a customer with a solar panel generates that they don't use themselves. A customer has a charge of $82.04 and a credit of -$4.10 on this mouth bill. How many kilowatt-hour did they generate that they didn't use themselves?

What is the amount due this month? $77.94

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How many kilowatt-hours did they use? 686 2/3

How many kilowatt-hours did they generate that they didn't use themselves? 34 1/6

Step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional