Where do i put parantheses into 140/2+12-4x2=2

What is the volume of the sphere shown below with a radius of 3?

Can some one me with these questions

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