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What is one times one divided by one plus one minus one? Can somebody compare cascade mountains and himalayas? I did to know if its a.negative b.zero c.undefined positive? EF = 18, AB = (5n - 9), and DC = (2n + 3). Find n, AB, and DC. ABCD is a trapezoid? When Mt St Helen's erupted was their lava and did anyone melt in it?