Find the edge length of the cube

Which statement about perfect cubes is true

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

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.