It is still 19.
It is about 4.4
7.9
4.7
It is 17, though if you need to show the precision, 17.0
d
9.58 approximated to the nearest tenths is 9.6
19
19.0
It is: 4.4
42.0
0.1 is a tenth, so this is already rounded to that level. You could also say it's 19 and one tenth.
Rounded to the nearest tenth: 18.8 Rounded to the nearest whole number: 19 Rounded to the nearest ten: 20.