Find the value of p if the arithmetic mean of 3 and 3p+5=31

One integer is 8 times another. if the product is 72, then find the integers

Atransformation t : (x,y) (x-5,y +3) the image of a(2,-1) is

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