- Isotope 14C Half life=5715 yrs Initial Quantity 19g What is amount after 1000 yrs?

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Calculating thickness of ice? Consider 2 RVs X and Y both of zero mean. Suppose E[XY]=4, var(X)=9 and var(Y)=16. What is the correlation coefficient? X^2-6x+15? If y= f(x)= 4x-7/2x-4 then prove that f(y) = x? CHEM QUESTION: The constant of a reaction is 0.025 M-1 s-1. If [A]0=8.00 M what is the concentration of A after 25 seconds? please show work?