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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.
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.
The answer for 600x190 is 114,000. Since both 600 and 190 have two significant figures, the answer should be rounded to two significant figures as well.
It already is rounded to three significant figures.
3078 to three significant figures is 3080. When rounding to three significant figures, the digit in the hundreds place (0) remains the same, while the digits after it (7 and 8) are greater than 5 so it is rounded up.