The value of a mountain bike y ( in dollars) can be approximated by the model y=200(.75)t , where t is the number of years since the bike was new. When will the estimated value of the bike be $50.00

Logical equivalent of the give question is its contrapositive

Set up a system of equations

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.