what does x represent

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

How many lines can be drawn through points j and k? 0 1 2 3

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%