Please help me I’m stuck on all these

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%

Divide. –4.2 ÷ 6 = a –0.7 b 0.7 c –7 d 7 me

What multiplys to be 1 but adds up to be 4