Can someone plzzz me with numbers 8 and 9 plzzz show work plzzz

Answer this question, only if you know the answer. 30 points and brainliest!

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%

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)