Ineed with this question an i cant get it wrong

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

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

What is the length of the midsegment of a trapezoid with bases of length 15 and 25 ?