Find the precision for each measurement. 120 meters, 7 1/4 inches, 30.0 millimeters

Answer 1

precision 120meters is to the nearest ten meters
7 1/4 is to the nearest 1/4 inch
30.0 mm is to the nearest .0001 (then thousandth) mm. This is the most precise of all three

Answer 2

how is 30.0 to the nearest 0.0001?

Maybe you meant nearest 0.0001m, not mm?