Do it for me, please

What is the solution of sqrt x+2-15=-3

If eh = hg and hg=16, find the diameter of k

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.