Find the constant of variation for the relationship shown in the following table

Can someone me i’m confused. will give brainliest and a whole bunch of points

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

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.