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What formula would I use to find the sum of 3(-2)^n from n=2 to n=8? What is the function of a cellâ€™s selectively permeable plasma membrane? Can someone help me solve this math problem. find the arc of AB? What is the advantage and disadvantage single coupling and double coupling generator? Full of a bus goes over a bump and swings with 1 Hz On the way back he weighs only half. With how much he Hz
swinging now?