Ashipping company charges a flat rate of $7 for packages weighing five pounds or less, $15 for packages weighing more than five pounds but less than ten pounds, and $22 for packages weighing more than ten pounds. during one hour, the company had 13 packages that totaled $168. the number of packages weighing five pounds or less was three more than those weighing more than ten pounds. the system of equations below represents the situation. s+m+i= 13 7s+15m+22i=168 s-i=3 which matrix can be used to show the number of packages in the different weight classes during that hour?