Find the sum of the first 6terms of the series 3-6+12-24+-65-64-62-63

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

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

In the diagram below,abc is congruent to dec what is the value of x