- ∫2^-x dx please help me to solve this integral?

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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? Could a black hole exist within the event horizon of a bigger black hole? I'm trying to find a compound that contains an alkaline earth metal and a polytomic ion and then finding its molar mass.? How long do the batteries in Beats executives last? Help me to solve the following question!
Find integers x and y such that 57x+79y=17, and 400