Using the 10 digits in our number system, write the following compact numbers using the digits only once: (a) the largest whole number (b) the smallest whole number (c) the largest 3-place decimal (d)

Using the 10 digits in our number system, write the following compact numbers using the digits only once: (a) the largest whole number (b) the smallest whole number (c) the largest 3-place decimal (d) the smallest 3-place decimal.

Now calculate: (1) the sum and the difference between whole numbers in (a) and (b)

please help me this is very urgent i wont be able to pass my grades just because of this question.....