This would be known as a multiple regression model. As you can probably guess, "multiple" means "many" which is how you can remember it.
The answer is choice B.
-3x-3 is the correct answer
The answer to 3 3/16 divided by 3/8 is 8 1/2. This is because you have to turn the mixed number into an improper fraction and then divide by the method of keep change flip in order to get your answer