math problem?

Question

1. What are the lengths of the segments into which the y-axis divides the segment joining (-6,-6) and (3,6)?

2. Find the lengths of the medians of the triangle whose vertices are (3,13), (-1,6) and (8,-7).

3. Find the centroid of a triangle whose vertices are(-2,8), (-6,4) and (-1,5).

thanks

Answer 1

3. Find the centroid of a triangle whose vertices are(-2,8), (-6,4) and (-1,5).

x=(-2-6-1)/3=-3
y=(8+4+5)/3=17/3