A boat is heading towards a lighthouse, whose beacon-light is 121 feet above the water. From point A, the boat’s crew measures the angle of elevation to the beacon 5, before they draw closer. They measure the angle of elevation a second time from point BB at some later time to be 10. Find the distance from point A to point B. Round your answer to the nearest foot if necessary.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

c.

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my answer got deleted but it's a

step-by-step explanation: