Please help much appreciated!

Aportion of a line bounded by two points is defined as

Find the average speed of a rabbit that runs a distance of 22 m in a time of 1.8 s .

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.