These two functions:

1. y=0.000495238x^{3}-0.120286x^{2}+9.53619x-238

2. y=0.0000208333x^{4}-0.0141667x^{3}+3.56667x^{2}-393.833x+16090

meet at point (120,30) at a harsh vertex point.

How do you smooth this point so the functions meet seamlessly?

(120, 30) 60 70 80 90 100 110 120 130 140 150