PLEASE HELP
I need help on number 20.

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%

What describes horizontal cross section of the right rectangle 6m 8m 5m

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)