#### Answer

5
2
2
4

#### Work Step by Step

There are 5 significant figures in 56.003 g.
There are 2 significant figures in 0.0056 cm. The zeroes before the 5 and 6 digit are there are placeholders and merely provide us information about its relative size.
There are 2 significant figures in 750 mL. The zero in the ones place doesn't count as a significant figure as it acts as a placeholder.
There are 4 significant figures in 0.4005 dg. The zero in the ones place is a placeholder.