Can someone please solve this using Factoring method2x^2 -7x -15=0

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

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.)

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account