Calculus: Moments-Are these correct ?

[MitsuShai]

1. Calculate the moments Mx and My and the centroid of the lamina with density 15 that is in the shape of the region bounded by y=-x^2+1 and y=-3

I got the My and xbar. However, I keep messing up when doing the ybar and the Mx; I messed up like 5 times (no laughing). This time I got:
ybar: 24
Mx= 256

are these right?

I would show my work but that's A LOT of typing and the work on my paper is really really messing because I kept messing up. I know it's basically just plugging in numbers to the formula, but I mess up at every and any little thing.

 

[MitsuShai]

nevermind.