Can somebody answer this for me I don’t get it and please explain it please, Thank you

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%

Which table shows a proportional relationship between miles traveled and gas used?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)