- 6+(8+2^2)-2{22-4[7-(9-7)]+1} please solve.?

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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 can i determine crop coefficient of constructed wetland macrophytes? In equal-tempered tuning the frequency (in Hz) of the note one tone above 220 Hz is...? Differentiate(t) = (cos^3 t+ 3cost +7)^9? What is the partial pressure of N2 in a mixture of N2 and O2 having a total pressure of 1075 torr if the partial pressure of O2 is 720 torr?