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A cargo ship is 4.2 miles from a lightho...

A cargo ship is 4.2 miles from a lighthouse, and a fishing boat is 5.0 miles from the lighthouse, as shown below. The angle between the straight lines from the lighthouse to the 3 vessels is `5^(@)`. The approximate distance in miles, from the cargo ship to the fishing boat is given by which of the following expressions?
(Note: The law of cosines states that for any triangle with vertices A, B and C adn the sides opposite those vertices with length a, b, and c, respectively. `c^(2) = a^(2) + b^(2) - 2ab cos C`).

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