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What is the area of a triangle if its base is 9cm and its heigth is 8 cm? A boat is rowed upriver at speed of 2.8m/s relative to water. the boat is moving at 0.6 m/s heading upriver. Whats the speed of the river? Which is the larger dose .1 or .25? SOLUTION: One number is 4 times as large as another. The sum of their reciprocals is 35/4. Find the two numbers? Suppose a ball is launched upward at 20° above the horizontal plane. How fast is it moving at the top of its curved trajectory?