If I make a linear sequence of numbers e.g. from 100 to zero step -10, then take the square root of each number and make a chart of these square roots, it has a kink around 9 and 10. I can’t upload an example sorry, but here is the data:

Sequence Sqrt()

100 10

90 9.48683298050514

80 8.94427190999916

70 8.36660026534076

60 7.74596669241483

50 7.07106781186548

40 6.32455532033676

30 5.47722557505166

20 4.47213595499958

10 3.16227766016838

0 0

The chart of the Sqrt() column has a downward kink at 9 on the x axis, followed by an upward kink before 10. Why is this?