an,et bisquel ede poles lebot end is pot how batista devi Engine In the construction of bridges, engineers use a formula to help determine the allowable stress on a bridge rocker, a component of the bridge that handles the stress and weight placed on the pavement of the bridge. The engineers use the formula F = d(F -13), where F is the strength of the steel in kilopound per square inch and d is the diameter of the rocker in millimeters. anenge enbod mun and smith's world yonom de mayothe omse simsa Solve the formula F = # d(F - 13) for d. F = 4 d(F-13)