You can draw a right triangle with the informatio.
The vertical change in elevation (unknown) is the opposed leg to the angle 15°
The distance from the surveyor to the point vertically below the point on the mountain is the adjacent leg = 6 miles.
Then tan(15°) = x / 6 => x = 6tan(15) = 1.61 miles
Answer: 1.61 miles
The answer I think is 2+7+0.15x_>15
Answer:
It is called the constant ratio.

Use the table of trigonometric ratios /in a picture/.
Answer: m∠A ≈ 70°
Answer:
The solution is in the attached file