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What is the area of a triangle if its base is 9cm and its heigth is 8 cm? A ball goes up at initial velocity of 28 m/s. ball is caught at the same height it was hit. what veloc does ball land in the catcher mitt? Is dark matter mass less and what is the difference with Higgs particles? What is -10 to the second power? (6-i)/(3+2i) simplify in complex form thank you!?