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Using the rules for identifying significant figures, identify the last significant digit by placing a line above that digit (Example: 100 m).

1. 1.50 L of bottled water
2. 2.000 X 10^3 lbs of dirt
3. 93,000,000 mi to the sun
4. 1.500 mg of aspirin
5. 6.02 X 10^21 atoms Cu
6. 30800 μm in diameter
7. 8.30 X 10^8 m deep
8. 102.5 MHz is WDVE
9. 3.00 °C
10. 20.090 lb flour

Answer :

Final answer:

Significant figures in given numbers are identified and the last significant digit is determined using specific rules.

Explanation:

The last significant digit in each number can be determined by following the rules for identifying significant figures:

  1. 1.50 L of bottled water: The last significant digit is 0, since it is not followed by any non-zero digit.
  2. 2.000 X 103 lbs of dirt: The last significant digit is 0, since it is not followed by any non-zero digit.
  3. 93,000,000 mi to the sun: The last significant digit is 9, as it is followed by a non-zero digit (3).
  4. 1.500 mg of aspirin: The last significant digit is 0, since it is not followed by any non-zero digit.
  5. 6.02 X 1021 atoms Cu: The last significant digit is 2, as it is followed by a non-zero digit (1).
  6. 30800 μm in diameter: The last significant digit is 0, since it is not followed by any non-zero digit.
  7. 8.30 X 108 m deep: The last significant digit is 8, as it is followed by a non-zero digit (0).
  8. -3.00 oC: The last significant digit is 0, since it is not followed by any non-zero digit.
  9. 102.5 MHz is WDVE: The last significant digit is 5, as it is followed by a non-zero digit (2).
  10. 20.090 lb flour: The last significant digit is 0, since it is not followed by any non-zero digit.

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