A farmer has a water tank for cows in the shape of a cylinder with radius of 7 ft and a
height of 3 ft. The tank comes equipped with a sensor to alert the farmer to fill it up
when the water falls to 20% capacity. What is the volume of the tank be when the
sensor turns on?

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.