Answer
72$^{\circ}$ 47'
Work Step by Step
1. Redistribute one degree from the 90 degrees, and change it to 60 minutes.
89$^{\circ}$60'-17$^{\circ}$13' = ?
2. Subtract degrees from degrees and minutes from minutes
89$^{\circ}$ - 17$^{\circ}$ = 72$^{\circ}$
60'-13' = 47'
Answer : 89$^{\circ}$60'-17$^{\circ}$13' = 72$^{\circ}$47'
