|3x+6|=-12 solve for absolute value

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

Quadrilateral abcd in the figure below represents a scaled-down model of a walkway around a historic site. quadrilateral efgh represents the actual walkway. abcd is similar to efgh. what is the total length, in feet of the actual walkway?

Aflower has 26 chromosomes. to create a new flower,how many would a sperm cell have what is called?