Ignore number 2, do number one pls. 5th grade math. correct answer will be marked brainliest!

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

Kendra had twice as much money as kareem. kendra later spent $8 and kareem earned $6. by then, the two had the same amount of money. how much money did each have originally?

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0