In need of help on Algebra 2 work

What is x3+3x2−16x−48 divided by x−1?

B. two events are dependent if the occurrence of one event changes to occurrence of the second event. true or false

Which of the following is the major negative aspect of crossover designs for research studies? a. prohibitive cost b. residual effects c-subject drepout d. incomplete randomization e. large sample size required