The answer depends on the units used for 17.35 It should be obvious to anybody that the answer for 17.35 pints and 17.35 gallons, for example, will be very different.
what is 21068 rounded to the nearest ten thousand
Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to, in this case, the second number. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out. If your target digit is 9, it will become a zero and increase the digit to the left of it by one.
3.42 rounded to the nearest whole number is 3
50
If you are rounding to hundreds, yes.