The midpoint of segment mn is point g (10, 8). one endpoint is m (6, 9). what are the coordinates of point n, the other endpoint?

Start with the midpoint, G(10,8), and move your pencil point 4 units to the left and  1 unit up to reach the endpoint M(6,9).  To find the other end point, start with the midpoint G(10,8) again, but now move your pencil point 4 units to the right and 1 unit down.  Result:  N(14,7).

Check:  find the mean of the 2 x-coordinates:  Does (6+14)/2 = 10, the x-coordinate of the midpoint?  YES.  Does (9+7)/2 = 8, the y-coord. of the midpoint?  YES.

The desired other end point is therefore N(14,7).

3x^3-x^2+6x-9

i would say c is the best answer, hope it's right!

good luck! =)

cutie~