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From a point A at the foot of the mountain, the angle ofelevation of the top B is 60. After ascending the mountain onemile at

From a point A at the foot of the mountain, the angle ofelevation of the top B is 60°. After ascending the mountain onemile at an inclination of 30° to the horizon, and reaching a pointC, an observer finds that the angle ACB is 135°. The height of themountain in feet is:

a. 14386

b. 12493

c. 11672

d. 11225

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