- Let x and y be jointly continious with PDF fxy(x,y)= x+y find covarience of x and y?

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When they travel to mars , will they come back ? Is there such thing as an EPIGENETIC MUTATION, if so, can you give an example? AP Physics: We have to rank wires in order from greatest resistance to least resistance. However I need help? What is gcd(12!, 15^3)? Find the length of the curve over the given interval.
polar equation
r = 4a cos(θ) interval
-pi/2 <= theta <= pi/2?