Pls help im stuck on this problem

What is the quotient of 42/3 divided by 4 1/5

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.

Write as a product: ac^2–ad+c^3–cd–bc^2+bd