What is the measure of Lx?

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

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.