What is the determinant of the coefficient matrix of the system {-x-y+2z=5 {3x+2y-z=3 {4x+4y-8z=-2 a. 0 b. 16 c. 18 d. 40

Need on this one asap im almost done with this subject

According to the data set, where should the upper quartile line of the box plot be placed?

The table shows the age and finish time of ten runners in a half marathon. identify the outlier in this data set. drag into the table the ordered pair of the outlier and a reason why that point is an outlier.