1. Which of the following expressions is not equal to 0.00055?
55 • 10^-5
5.5 • 10^-4
5.5 • 10^4
0.55 • 10^-3
2. A satellite can move at 17,000 miles per hour. How many hours will it take to reach a star that is three light years away? Recall that 1 light year = 9.5 ∙ 10^12 kilometers and 1 kilometer = 0.62 miles. Show your work.
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