- Why is radon and helium not found in the atmosphere?

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Suppose f(x,y)=2x for 0 < x <1, 1 < y < 2. The joint PDF is zero outside this range. What is E[X]? How would you graph y is less than or equal to -15x + 100? For the gas-phase reaction A->B the forward reaction=1.5-2s-1, reverse=3.04-4s-1, what is the value of Keq? How to show that for each integer n≥0, 1+10^(231+462n) is divisible by the squares of at least two different primes? Hi ,could you help me , I can't understand question 20 please step by step ?