For finding values related to a normal probability distribution function, it is convenient to use a suitable calculator or spreadsheet. (See below)
If all you have is a z-table, you must calculate the corresponding z-value and look it up in the table.
z = (X -µ)/σ = (56 -54)/8 = 1/4
You are interested in the area above z=1/4. The table in the second attachment gives the area between z=0 and z=1/4. So, the area of interest is the table value subtracted from 0.5 (the total area above z=0.):