For your next print mail campaign, you learn that the cost to print 5,000 postcards is $4,800 and cost to print 15,000 is $5,500. what is the marginal (extra) cost per postcard for the additional 10,000?

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.