- Y=4x-6arctan(x) Find what interval(s) the function is concave up/down?

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If you are solving angle ABC, which angle are you looking for? 2x+3x? I'm confused ( please don't delete)? Why does the modern atomic theory used today represent the best explanation scientists have to offer? What is (ln x-(3/2x))^2? Of the following which is the weakest acid?
a. H3PO4
b. H2PO4^-1
c. HPO4^-2?