A medium sized apple has 70 calories. This is 10 calories less than 1/4 of the calories in an old chocolate bar. We need to find out how many calories are in the bar? What could be a model for the first step?

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.