Please help easy maths thanks so much

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

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%