Nick is going on a hike. As he hikes, he goes up and down in elevation. If elevation is a function of time, what elevation will Nick be at when he has hiked for 20 minutes? 50 minutes?

What elevation (in feet) will Nick be at when he has hiked for 20 minutes?

Without any information about the specific route or the speed at which Nick is hiking, we cannot determine the elevation he will be at after 20 minutes. The elevation could be any value depending on the terrain and the path he takes.