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A ship is moving at a speed of 30 km/h parallel to a straight shoreline. The ship is 6 km from shore and it passes a lighthouse at noon.
(a) Express the distance between the lighthouse and the ship as a function of , the distance the ship has traveled since noon; that is, find f so that s = f(d).
(b) Express as a function of , the time elapsed since noon; that is, find so that d = g (t).
(c) Find f o g. What does this function represent? |
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