What is the correlation coefficient for this data set? (round to the nearest hundred)

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

What sums are equal to 6/12? choose all answers that are correct a.6/12+6/12+6/12+6/12+6/12+6/12 b.2/12+1/12+1/12+2/12 c.5/12+1/12 d.1/12+1/12+1/12+3/12 plz : )

2x minus y equals 6, x plus y equals negative 3