Which regression should I use for this data?

Hello there,

I have done a few observations:

Code:

` x | y`

--------+-------

150 | 7.4

130 | 11.6

110 | 18.8

90 | 33.2

70 | 61.4

50 | 120.8

30 | 239.8

20 | 335.0

10 | 453.0

5 | 518.8

0 | 587.4

-5 | 655.2

-10 | 721.0

-20 | 833.4

-30 | 908.8

-40 | 959.6

I plotted them in on my calculator and tried all the regressions it could calculate for me. They are: LinReg, QuadReg, CubicReg, QuartReg, ExpReg, PwrReg. None of these could calculate a regression that I thought was close enough for my data.

What I wanted to ask is either:

a) If somebody with a better calculator would calculate a really close regression for me, or

b) let me know of some website where I can do it myself.

Thank you for your time.

Kind regards,

Marius Jonsson