Can any1 help me find the midpoint that is between the following points C(-3,9) and D(4,-11)?

sure. Easy.

xm= 1/2 (-3 + 4)

ym= 1/2 (9-11)

thax... but my teacher said that's wrong...im confused

I apologize for the confusion. It seems like you made a slight error in calculating the midpoint. Let's go through the correct steps to find the midpoint between points C(-3,9) and D(4,-11).

To find the midpoint, we need to find the average of the x-coordinates and the average of the y-coordinates of the two given points.

1. Average of the x-coordinates: (x1 + x2) / 2
In this case, the x-coordinates are -3 and 4.
So, ( -3 + 4 ) / 2 = 1/2

2. Average of the y-coordinates: (y1 + y2) / 2
In this case, the y-coordinates are 9 and -11.
So, ( 9 + -11 ) / 2 = -2

Therefore, the midpoint between C(-3,9) and D(4,-11) is (1/2, -2).

I hope this clears up any confusion. Let me know if you have any further questions!