Question 754878
Trigonometric ratios
Tan(4)degrees = opposite/17
 Opposite = tan(4) x 17 = 1.2
He moves 12miles closer, so 5 miles from mountain
Using tan = opposite/adjacent
      tan = 1.2/5
      tan = 0.24
   tan^-1 = 13.5 degrees
Hope this helps
:-)