Given any number it is easy to find a rule based on a polynomial of order 4 such that the first four numbers are as listed in the question and the tenth is the given number. That is, it is easy to find a rule so that any number can be the "tenth" in the sequence.
For example:
Un = (15n4 - 190n3 + 885n2 - 1430n + 840)/24 would give U10 = 1460
or
Un = (15n4 - 170n3 + 705n2 - 1090n + 600)/12 would give U10 = 3350
and so on.
The appropriate polynomial of order 3 is
Un = (-5n3 + 45n2 - 85n + 60)/3 according to which, U10 = 430.
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A tenth of 600 is 60.
The tenth place in this number is the 9.
To find one tenth of a number, multiply the number by 0.1, or divide the number by 10.
A tenth of a number deals with decimals. The way to think about a tenth is that 1/10 is one tenth, and 1/10 as a decimal is 0.1. therefore the first decimal place is always the tenth of a number, so to answer your question the nearest tenth of 15.58 would be 15.6.
The tenth triangular number is equal to (10 x 11) / 2 = 55.