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Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Use the graph of the sine function y=2sinθ shown below

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.