Sergei has a credit card that uses the average daily balance method. for the first 12 days of one of his billing cycles, his balance was $350, and for the last 18 days of the billing cycle, his balance was $520. if his credit card's apr is 14%, which of these expressions could be used to calculate the amount sergei was charged in interest for the billing cycle?

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

19

step-by-step explanation:

step-by-step explanation:

cats

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.