10,12,&14.

Mathematics
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May 21st, 2015

10. Pythagorean Theorem...4^2 + r^2 = (r + 2)^2

      16 + r^2 = r^2 + 4r +4

        16  = 4r + 4

         12 = 4r

          r = 3 

12.   x+5 = 9x^2 + x +1

        5 = 9x^2 +1

       4 = 9x^2

      4/9 = x^2

      x = 2/3 

14.  4x + 7 = 6x + 9

       7 = 2x + 9

      -2 = 2x

      x = -1


May 21st, 2015

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