Hi there if anyone could explain and give the answer it is much appreciated

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

3c2 + 2d)(–5c2 + d) select all of the partial products for the multiplication problem above.

Aresearch study is done to find the average age of all u.s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample