Use the given information to decide which lines, if any, are parallel. Justify your conclusion. a.) m ∠2 + m ∠3 = 180° b.) ∠1 ≌ ∠ 9 c.) m ∠3 + m ∠6 = 180°

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.)

What is sin 7x/4 ? i need on this urgent trig

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning