Help me please it is math lol

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

Could someone with number 1 and 2

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)