Pls help What is true about the following sequence: 2.7, 6.5, 10.3, 14.1, 17.9*

It has a common ratio of approximately 2.4
It is neither a geometric nor an arithmetic sequence
It has a common difference of -3.8
It has a common difference of 3.8

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