- Need help solving this equation with the exponent laws?

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Let X1 & X2 have joint pmf p(x1, x2)=(x1x2)/36. 0 otherwise Find joint pmf of Y1=X1X2 and Y2=X2? How many degrees of strog base and strog acid? What forms when propene reacts with HCN? 6g of Mg in 16g of O2 are burnt. Calculate mass of MgO formed.? If you started with 3.60g of Copper and reacted it with an excess of nitric acid what mass of copper hydroxide would you expect to recover?