What are the two numbers and how did you figure it out?

Pls! does anybody know a shortcut for answering these types of questions in the future?

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)