On a recent quiz, the class mean was 70 with a standard deviation of 4.4. Calculate the z-score (to 4 decimal places) for a person who received score of 73.52.

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.

Find the equation for the area of a circle and divide that by 2