Atrapezoid with two adjacent acute angles is rotated around a line containing the side adjacent to these
angles.
sides bc and ad are neither perpendicular nor parallel tol, so they form conical surfaces. side cd is
perpendicular y tol, so it forms a curved cylindrical surface. the figure formed by the rotation is a
composite of
cones with a cylinder in between.

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.