Answer:
h = 700 - 13t
Explanation:
The hiker is at a height of 700 meters and begins to descend. 
She is descending 13 meters per minute rate. 
Therefore, after t minutes she will descend by 13t meters. 
So, finally, the elevation of the hiker after t minutes will be (700 - 13t) 
If we represent h as the elevation of the hiker after t minutes, 
then h = 700 - 13t is the function which describes the climber's height of elevation after t minutes. (Answer)