Can someone help me please with this

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

Select 2 statements that are true about the equation y+6=-10(x-3).1) the slope of the line is -102) the slope of the line is 33) one point on the line is (3,6)4) one point on the line is (3,-6)

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.