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Given: DC is a tangent of E. AE = 20 and DC = 9. What is the measure of AC? Find the root of the function y=2.5sin(x/2 +1) between x=5 &-5? Is there a diameter earths solar system? Can a particle projector be a good science fiction weapon? The position of an object at time t is given by s(t) = -4 - 2t. Find the instantaneous velocity at t = 6 by finding the derivative ?