A ball is thrown from an initial height of 3 feet with an initial upward velocity h = 3 +35t-161
Find all values of t for which the ball's height is 21 feet.

Find the distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)

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