How many possibly outcomes of flipping a coin four times?

Solve the system of equations y= 3/2 - 1, -x+ y =-3

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)

Me. i can't figure out this question. give an explanation too. .