Which of the following is true about the values of 3x and 9 for x>0?
For all x>0, it is true that 3x<9.
For all x>0, it is true that 3x>9.
There is a constant c such that if 0<x<c, then 3x<9, but if x>c, then 3x>9.
There is a constant c such that if 0<x<c, then 3x>9, but if x>c, then 3x<9.