for the region bounded by the curves y=0 and y= +squareroot(9-x^2) (only the positive portion of that function, i think thats why there is a plus sign in front of the squareroot) find:

1. its area

2. M sub x

3. M sub y

4. X bar (x with a bar on top of it)

5. Y bar (y with a bar on top of it)

6. the centroid

i have no idea how to do this problem...