A plane flying a straight course observes a mountain at a bearing of 30.2 to...

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A plane flying a straight course observes a mountain at a bearing of 30.2 to the right of its course. At that time the plane is 9 kilometers from the mountain. Ashort time later, the bearing to the mountain becomes 40.2. How far is the plane from the mountain when the second bearing is taken (to the nearest tenth of akm)?7 km13.1 km4.7 km11.5 km

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