Arandom sample of 30 receipts for individuals shopping at the community drug store showed the sample mean to be`x = $28. 19 with sample standard deviation s = $4.06 a. use chevyshev’s theorem to find the smallest interval centered on the mean in which we can expect at least 75% of the data to fall.

The first few steps in solving the quadratic equation 9x2 + 49x = 22 ? 5x by completing the square are shown. 9x2 + 49x = 22 ? 5x 9x2 + 54x = 22 9(x2 + 6x) = 22 which is the best step to do next to solve the equation by completing the square? 9(x2 + 6x + 3) = 25 9(x2 + 6x + 3) = 49 9(x2 + 6x + 9) = 31 9(x2 + 6x + 9) = 103