दुर Ship A is 75 miles north of ship B. Ship A sails due East at a rate of 20 miles per hour. Ship B sails due West at a rate of 12 miles per hour. How rapidly is the distance between them changing 5 hours after they start (that is, 5 hours after the time A is north of B)? the answer is 28.974 mph I just need to show work

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.