Tickets to a play normally cost $60. the cost is $45 if reserved early. if total ticket sales to a particular play were $2,400, which equation best models the number of normal tickets, x, and reserved tickets, y, sold? a. 60x+45y=2400 b. 2400−(xy)=60−45 c. 105(x+y)=2400 d. x+y=2400

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.)

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

The points (1, 7) and (0, 2) fall on a particular line. what is its equation in slope-intercept form?