Integrating
gives

Notice that
forces all terms in the sum to be 0, so that

and hence

making the first option correct.
Factor
(x-8)(x+3)
Check:
-8+3=-5
-8*3=-24
Use ZPP
x-8=0
x=8
x+3=0
x=-3
Final answer: x=-3, x=8
Answer:
.
Step-by-step explanation:
This is called random sampling. the other type of sampling is stratified sampling. :)