Look at the picture, help me ;-;

What is the value of the expression below? (81^2)^1/8

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.

Solve the equation by completing the square. x^2+2x=17