Which measure of center is best to use for this set of data?

45, 39, 49, 37, 3, 51

Iam so stuck. what is the worked out answer for this question?

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?