Please help me!! Need help with geometry! Thank you so much!!

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

Ineed to know the answer to this algebra question.

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)