On a Saturday night, 50% of people bowling at a bowling alley get a strike. 20 people are randomly selected. Let X be the number of people who get a strike. What normal distribution best approximates X?

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.