Hi! The direction is already stated on the image.

DIREC'I'IW: Answer The given problem involving Thermal Expansion. Solve iT in a sTepbysTep process by sTaTing The given, required, fomla, solution, and answer. A sTeel beam 12.0111 siTs nexT To a concreTe wall when The TemperaTure is QUITE. A gap musT be left beTween The beam and The concreTe wall for expansion purposes. If The TemperaTure rises To 450C, how large musT The gap be if The sTeel beam jusT Touches The concreTe wall