Marilyn lives 3.5 block from the library. she leaves the library and walks 3.5
blocks before realizing she is walking in the opposite direction from her house.
after walking 3.5 blocks back, how far does marilyn have to walk?

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