Write the equation in standard form for the parabola with vertex (0,0) and directrix y=-6

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?

If there are 3.281 feet in 1 meter, how many inches are in one centimeter

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