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Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.

Given: m zade = 60° and m2cdf = (3x + 15) prove: x = 15

Find the sum of the given arithmetic series. 24 + 17 + 10 + 3 + + (–39)