- How do you calculate enthalpy of temperature not given on steam table.eg 44 degrees?

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A relation ~ is defined on the set Z by the rule x~y if and only if x-y is a multiple of 4. Prove the relation ~ is reflexive and symmetric? If x^2+6x=9, what is the value of (x+3)^2? The answer is 18. I completed the square but i'm not sure what to do next? What would the world be like after an asteroid hits the earth? Why is human reproduction so disgusting ? Find the inverse function of f(x) = sqrt(4-x^2) on the domain [0,2]?