12.) solve the inequality.
11d - 9 ≤ 15d + 3

a.) d ≥ - 3

b.) d ≥ 6/13

c.) d ≥ - 1 1/2

d.) d ≥ 3/13

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)}