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Mathematics, 14.07.2019 08:00 Homepage10
11 and 13 only11. the sum s of the first n consecutive positive integers, 1, 2, 3, , n, is given by the formula s=0.5n(n+1). find n when s=120 and check your answer by addition.13. a boat travels downstream (with the current) for 36 miles and then makes the return trip upstream (against the current). the trip downstream took 3/4 of an hour less than the upstream trip. if the rate of the current is 4 mph, find the rate of the boat in still water and the time for each part of the trip.
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11 and 13 only11. the sum s of the first n consecutive positive integers, 1, 2, 3, , n, is given by...
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