What makes a unique triangle a unique triangle?

For the equations below which statement is true ?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?