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Find 7a + 4b. a = 7i - 6j, b = 6i + 3j i - 30j 2.75i + 30j 3.73i + 30j 4.74i - 30j 5.74i - 29j

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A woman walks due west on the deck of a ship at 2 mi/h. The ship is moving north at a speed of 25 mi/h. Find the speed of the woman relative to the surface of the water. Round the result to the nearest tenth mi/h 2.25 mi/h mi/h mi/h mi/h