What is the next number in the sequence 3, -6, 12, 4, 20?

Which of the following statement about pascal's triangle are true?

Empty box + box + empty box fill in the box is equal to 30 how

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%