The quantity of an element is decaying over time such that the amount of material at any time is given by the function D(t) = 1900(0.9)3t. Write an equivalent function
of the form D(t) = ab'.

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Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

How to do this , and can some one explain