Find the value of x if a, b,and c are collinear points and b is between a and c. ab=3x, bc=2x-7, ac=2x+35

Can any one me with the answers to these questions asap?

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%

The area of square garden is 300m squared. how long is the diagonal?