## anonymous 3 years ago A plate occupies the region D shown in the diagram. ( a square with a square hole). the plate has surface density p(x,y)=9x^2 Find mass m of the plate.

1. anonymous

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2. anonymous

$9\int\limits_{y=-2}^{y=2}\int\limits_{x=-2}^{x=2}x^2dxdy-9\int\limits_{y=-1}^{y=1}\int\limits_{x=-1}^{x=1}x^2dxdy$

3. anonymous

Tu comprende?

4. anonymous

oui

5. anonymous

merci.

6. anonymous

Excellent