Write 7.65040 x10-4 power in scientific notation

Taking algebra two apex courses and need with these questions

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)

Maria solved an equation as shown below. what is the solution to maria’s equation?