Which of these numbers is the most precise approximation of?

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

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)

The square root of 9x plus 7 plus the square rot of 2x equall to 7