What is the next number in the pattern 3, -6, 12, 4, 20

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.

Which of these tools or constructions is used to inscribe a hexagon inside a circle?

Are the corresponding angles congruent? explain why or why not.