Y = 4x - 30 plz help me solve thanks

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Given the graphed function below which of the following orders pairs are found on the inverse function

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.