Can someone help?

Mary had at least an 80% on her test write an inequality to represent this situation

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

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%