19. Use the unit circle to find the value of tan 315º.
Show work pls.

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.)

Two parallel lines are crossed by a transversal.what is value of x

Is the square root of 4 plus the square root of 16 rational?