Which best explains why the given lines are or are not perpendicular? x=−8, x=7

The number of possible solutions of a polynomial can be found by looking

Me with this one question, and i'll upvote the brainliest answer

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.