Abuilding casts a shadow over 72 meters long. at the same time, a parking meter that is 1.2 meters tall casts a shadow that is 0.8 meter long. how tall is the building?

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.