5. When the calculated value 0.00478530 is rounded to three significant figures, it becomes 0.479 b. 0.005 C. 0.00479 d. 0.00478 e. 0.004 6. When the following calculation is performed, how many significant figures does the answer con- tain? 1.643 X 10' +1.2 x 10 a. 0 b. 1 c. 2 d. 3 e. 4 7. Convert the measurement 6.69 ft to yards with the correct number of significant digits. a. 2.230 yds b. 2.23 yds c.2.2 yds d. 2 yds e. none of the above are correct