You notice a hot air balloon ascending. The elevation h (in feet) of the balloon is modeled by the function h(x)=3x+60, where x is the time (in seconds) since you first noticed the hot air balloon. Graph the function and specify its domain and range. Then interpret the slope and intercept of the graph.

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min