Typeerror: tuple indices must be integers or slices, not str when referencing arg with a vairable.

Ineed someone to me answer my question i have to have this done and knocked out

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

Agallon of apple juice cost $7 a pack of eight 4.23oz box of apple juice $2.39 which is a better deal