14+13y=20y-21
need help figuring out the steps

40 describe the outliers from the scatter plot.

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.

Having a hard time understanding this question (see attachment).