Please help me with this question

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.

Find the solution(s) to x^2-14+49=0

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585