- Ia anyone good at statistics that could help me out?

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I made a typo earlier, excuse me. I still donâ€™t understand how to do this. Find b such that f(x)=-4(x^2)+bx+3 has a maximum value of 50? If the fifth term of a geometric sequence is 81 and the common ratio is 3/4, find the sum of the first 20 terms? How can an ion that is not present in the principal equilibrium between a solid and its ions affect the solubility of the initial solid? You removed the article on no life in the visible universe that I viewed on June 21 2018 why?!? What should be added to equation to make it a perfect square 9x^4 + 2x^2 + 25? ....Please!?