__ 14. How many millignams are in 2.5 kg? a 2.5times 10^5mg 2.5times 10^-4mg b. 25 mg 2.5times 10^2mg __ 15. The closeness of a measurement to its true value is a measure of its: a. usefulness. c. accuracy. b. precision. d. reproducfbility. __ 16. Which of these measurements ents is expressed to three significant figures? a 0.070mm c. 7007 mg b. 7.30times 10^-7km d. 0.007 m __ 17. A metric unit of volume is the: c. km. a.L b. mg. d. K. __ 18. The number of seconds in a 40-hour work week can be calculated as follows: a 60stimes (1min)/(60s)times (1h)/(60min)= c. 40htimes (60min)/(1h)times (60s)/(1min)= b 1stimes (1min)/(60s)times (40h)/(60min)= d. 40htimes (60min)/(40h)times (60s)/(60min)= __ 19. The metric prefix kilo-means: c. 1000 times smaller. a. 100 times smaller. b. 1000 times larger. d. 100 times larger.

**14. How many milligrams are in 2.5 kg?**- To convert kilograms to milligrams, multiply by (since 1 kg = mg).- Correct answer: mg.**15. The closeness of a measurement to its true value is a measure of its:**- Accuracy refers to how close a measurement is to the true value.- Correct answer: c. accuracy.**16. Which of these measurements is expressed to three significant figures?**- Significant figures are the digits that carry meaning contributing to its precision.- Correct answer: b. km.**17. A metric unit of volume is the:**- The liter (L) is a metric unit of volume.- Correct answer: a. L.**18. The number of seconds in a 40-hour work week can be calculated as follows:**- Convert hours to minutes, then minutes to seconds.- Correct answer: c. .**19. The metric prefix kilo- means:**- Kilo- means 1000 times larger.- Correct answer: b. 1000 times larger.