Please help. Correct answer will be marked brainliest

Find the sum of the first 8 terms of the following sequence. round to the nearest hundredth if necessary.

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.

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1