3.74mL, as the 8 rounds up
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When rounded to three significant figures, 3.738 mL becomes 3.74 mL. Remember, to round to three significant figures, you start counting from the first non-zero digit from the left.
There are two significant figures in the measurement 0.0039.
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.
300.9
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.
4.884 has four significant figures and 2.25 has three significant figures. 4.884 x 2.25 = 10.989 = 11.0 rounded to three significant figures. When multiplying or dividing, the result must have the same number of significant figures as the number in the problem with the fewest significant figures.