I always, since high school never found a good trick to do these kind of questions.
Lets say you've got a table (x and y)
X: 1 2 3 4 5 Y: 1 3 7 15 31
How can I make a function out of it? I know that it probably is a exponential function and that
y = 2(y-1) + 1
however I'm stuck there. I'm not sure how plug it all in. I really need help for those kind of question since I do those often. If there's any procedures to determine a function base on a data table please tell me. Thank you!