There are two significant figures in the measurement 0.0039.
There are four significant figures in the measurement 1.050 L.
There are three. The 4, the 5 and the zero in between. The two last zeros serve only to properly space the decimal point which, in this number, is implied.
There are three significant figures in 43.0. The zero at the end of the number is considered significant because it serves to specify the accuracy of the measurement to the tenths place.
There are two significant figures in the measurement 3300g.
There are 4 significant figures in this measurement.
There are 3 significant figures in this measurement.
There are 3 significant figures in this measurement.
There are 2 significant figures in this measurement.
There are 2 significant figures in this measurement.
There are 2 significant figures in this measurement.
There are 3 significant figures in this measurement.
There are 2 significant figures in this measurement.
There are 2 significant figures in this measurement.
There are 5 significant figures in this measurement.
There are 3 significant figures in this measurement.
There are 2 significant figures in this measurement.