Colin maxed out his credit card at $4,000. the interest rate is 12.35%.
using an online calculator, colin determines that if he stops using the card and pays
$300 per month for the next 15 months, he will pay off his debt. how much interest will
colin have paid when his credit card balance is $0?

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363

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.