Which of the following expressions are polynomials? check all that apply. check all that apply. a. x^3+ 2x^2 b. 2x^-3 - 5x^-1 + 3 c. 1/4 x^5 + 1/3 x^4 -1/2 x^3 d. -9x e. 5/x -1

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.