A gap must be left for between railroad rails for thermal expansion. How much of a gap is needed if the length of a rail is $6\mathrm{.}84$ m and the maximum temperature is $57\mathrm{.}4$ oC more than the temperature at which the rails were laid? The coefficient of linear expansion is $11$ x $10-6(1/$oC$).$Give your answer in meters.$$Use scientific notation $(1\mathrm{.}23$E$+4).$