Are you in collage because you wont get the question unless you are lol

Hi if you want to play a sports related kahoot go to kahoot. it and type in this code: 659344

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

Find a third-degree polynomial equation with rational coefficients that has roots -2 and 6+i