Please help ASAP
Given f(x)=-5x^2+3, What is the value of f(3)?

Iwill make brain if you me correctly fill this out needs due today pls and send it back to me (click the link and you will get it)

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

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)