Marie just used her new credit card to buy a bike for $400. Her budget allows her to pay no more than $25 each month on her credit card. Marie has decided not to use the credit card again until the bike is paid off. The credit card she used has an Annual Percentage Rate of 21%.

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.