Simplify. 3/4−4x+1/2x−1/2+1/2x

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The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?

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.