If 9x - 7 + 19 + 3x - 1 = 180, what does x equal?

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%

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.