How do I write 588.18 in scientific notation

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.

Does the point (1, sqrt 7) lie on circle shown.

Ineed to know the answer to this algebra question.