Aslide is 21 ft long. to get to the top of the slide, you use a vertical 9 foot high rung ladder. what is the distance, b, from the bottom of the slide to the bottom of the stairs? round your answer to the nearest tenth.

Which function has an inverse that is also a function? a.{(-4,3), (-2, 7), (-1,0), (4, -3), (11, -7)} b.{(-4, 6), (-2, 2), (-1, 6), (4,2), (11, 2)} c.{(-4,5), (-2, 9), (-1,8), (4, 8), (11,4)} d.{(-4,4), (-2, -1), (-1,0), (4, 1), (11, 1)}