- 40 gram substance that has k value of .1455 find half life in days round to hundreth?

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3x^2-3x-4=0 quadratic formula please help? How many electrons can be held in an atom with the quantum numbers n=4 and L=3? How many have died so far in the earthquake in Mexico? Does anyone know how to solve 3x=x^17 ? F(x+iy)= ix^2. Using the def. of derivative, Calculus 3 methods, show that if Re(a) not equal = 0 then f(z) is not differentiable at z=a.?