How do I do this stuff

Which is the graph of the function y=2(4)^x

Abank gives 6.5% interest per year. what is the growth factor b in this situation?

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.