I really need help with this question. Someone?

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.

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

If value of cos330° is √3/2 then find tan165°.