The equation f(t)=13,000(1.024)^t models the annual tuition at a private school over time t by what percent does the tuition increase each year

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.

The answer is $23.63

The amount of gasoline consumed per hour because if you divide the amount of gasoline left by the distance he travels then you should be able to find out how much gas he is using per hour.