Helppp plz​

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

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?