PLEASE HELP DUE TODAY!!!
Robert needs to cut four shelves from a board that is 2.5 m long. The second shelf is 18 cm longer than twice the length of the first shelf. The third shelf is 12 cm shorter than the first shelf. The remaining shelf is 4 cm longer than the first shelf. If Robert must use the entire 2.5 m long board for the shelves, what is the length of the second shelf, in centimeters?