Y'' +2y'+y=e^-x+2x×e^x thỏa y(0), y'=1

Select all expressions that are equivalent to 2(3x + 7y). question 1 options: 6x + 14y 6x + 7y 1(6x + 14y)

Find the missing factor. write your answer inexponential form.9^2=9^4×

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