Help please (MATH).

Which equation represents the partial sum of the geometric series?

The step function g(x) is defined as shown.what is the range of g(x)? ***answer choices in picture.

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)