1. Using an order-of-magnitude analysis, estimate the number of gallons of gasoline used by all automobiles in the United States each year.

2. Using an order-of-magnitude analysis, estimate the number of breaths you will take during your lifetime 3.

3.10 Underline the significant figures in the following numbers (the first number is done for you): a. 3450 b. 9.807 c. 0.00216 d. 9000 e. 7000. f. 12.00 g. 1066 h. 106.07 i. 0.02880 j. 163.07 k. 1.207 x 10-33.11 Perform the following calculations, reporting the answers with the correct number of significant figures: a. (8.14)(260) b. 456/4.9 c. (6.74)(41.07)/4.13 d. (10.78 4.5) /300 e. (10.78 4.50)/300.0 f. (65.2 13.9)/240.0 g. (1.2 x 10%)/(4.52 x 10 x 769) h. (1.764 0.0391)/(8.455 x 10*) i. 1000/(1.003 x 10) j. (8.4 x 107%)/5000 k. (8.40 x 10)/5000.0 . 87 m. (2w 5)/10