Choose the correct sum of the polynomials (3x3 − 5x − 8) + (5x3 + 7x + 3). 8x3 + 2x + 5 2x3 − 12x − 11 2x3 + 12x − 5 8x3 + 2x − 5

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

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Factor and solve to find roots x squared -x - 90 =0