Damien has a balance of $10,200 on his credit card. he threw the card away so he can never use it again. he has 3 and a half years to pay off the balance. the interest rate on his card is 21%. when damien pays off his credit card, how much will he have payed in all?

Step-by-step explanation:

21% of $10200=$2142

Total amount Damien must have paid =$10200+$2142=$12342

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15