Income Range ($) | Progressive Tax Rate $40,000 salary/yr 0-10,000
3%
10,000 - 50,000
5%
50,001 - 100,000
5.5%

Math each whole number with a rational,exponential expression

What ratio is proportional to 18/21

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)}