a.80
b.1000
c.350
Dear student,
80,1000 and 350 are whole numbers.Therefore the whole numbers near that is that numbers itself.
Inorder to estimate to nearest whole number if there are numbers after decimal point following steps are taken
If greater than or equal to .5 round it to next number else that number itself
example after rounding these numbers become
3.4=3
3.7=4
If there is a mistake in your question please close the question and repost your query.I hope this helped you.