How many ways can three people be selected from a group of seven people if order DOES matter?

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

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