- 3x^2+7=-9x^2+4 in standard form ?

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In triangle ABC, sin A = 77, sin C = 23 and c = 16. find the length of A? Calculate the average density of the following astronomical body: Neptune. in kg/m^3.? (Using properties of logarithms) Could someone help with the last two in the screenshot? Please please help precalc? Need help with the following equation. xy=arctan (x/y) Not sure how to solve an implicit differentiation with arctan.?