What is the circumference of a circle with sector area 9π and arc measure 90 degrees?

Given a(-12,5) and b(12,29) find the point that divides the line segment ab three-eighths of the way from a to b

At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at a rate of 16 cubic feet per minute. the diameter of the base of the cone is approximately three times the altitude. at what rate is the height of the pile changing when the pile is 12 feet high? (hint: the formula for the volume of a cone is v = 1 3 πr2h.)

Aquadratic equation in standard from is written ax^2= bx+c, where a, b and c are real numbers and a is not zero?