21. What is the standard form of 9.12 × 106? 24. How is 57,900,000 written in scientific notation? A. 912,000,000 A. 5.79 × 108 B. 91,200,000 B. 5.79 × 107 C. 9,120,000 C. 5.79 × 10 D. 912,000 D. 5.79 × 105 22. The average depth of an ocean is approximately 1.2 × 104 feet. How is this depth written in standard form? A. 120,000 feet B. 12,000 feet C. 1,200 feet D. 120 feet 23. A speck of dust has a diameter of 675 ten-millionths centimeters. How is this diameter expressed in scientific notation? A. 6.75 × 10–4 centimeters B. 6.75 × 10–5 centimeters C. 6.75 × 10–6 centimeters D. 6.75 × 10–7 centimeters 6 25. The mass of two objects is being compared during a physics experiment. It is determined that object A has a mass of and object B has a mass of How many times larger is the mass of object A than the mass of object B? A. 0.1 B. 0.4 D. 40 C. 10 B. 8 C. 30 D. 80 27. The measure of a virus is 0.000085 cm. How is the measure of the virus written in scientific notation? A. 8.5 × 105 B. 8.5 × 10–4 C. 8.5 × 10-5 28. A book is about 9.3 × 10–2 meters thick. A bookshelf is about 1.865 × 101 meters long. About how many copies of this book will fit on the bookshelf? A. 17 books 26. A field is 1.2 x 103 yards long. A garden in the field is 0.4 x 102 yards long. How many times shorter is the length of the garden than the length of the field? A. 3 B. 20 books C. 200 books D. 498 books 29. A company had 21 billion dollars in sales last year. What are the sales of the company written in scientific notation? A. 2.1 × 107 B. 2.1 × 109 C. 2.1 × 1010 30. What is the standard form of 4.63 × 104 ? A. 4,630 B. 46,300 C. 463,000 D. 4,630,000 31. The populations of two towns, town A and town B, are being compared. The population of town A is and the population of B is How many times greater is the population of town B than town A? distance be written in standard form? A 778,400,000,00 . 0 km B. 7,784,000,000 km C. 778,400,000 km States. How is the number of books sold written in scientific notation? A. 3.1 × 106 B. 3.1 × 107 C. 3.1 × 108 D. 3.1 × 109 D. 77,840,000 km 33. What is 6.7 × 0.00065 expressed in scientific notation? A. 4.355 × 10–3 B. 4.355 × 10–2 C. 4.355 × 103 D. 4.355 × 106 34. A microgram is equal 36. The average distance of Mercury from the Sun is about kilometers (km). The average distance of Jupiter from the Sun is about 13 times the distance of Mercury from the Sun. What is the approximate average distance of Jupiter from the Sun, in km? to grams. How many times greater than a A. A. 0.2 microgram is grams? B. B. 0.5 A. C. B. D. C. 2 D. 5 C. 32 The average . distance from Jupiter to the Sun is about 7.784 × 108 km. How should this D. 35. In 2005, about 3.1 billion books were sold in the United

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