Its Obama's fault...Thanks Obama
30.1
There isn't any. As you go to the right, each place is one tenth of the previous place.
0.1
It needs to have decimals in order to round it to the nearest tenth ex:81.48 would be rounded to 81.5 because 4 is in the tenths place
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.
0.05
0.1
7.0
3.8
7.2
1.1