2different pairs of decimals whose sum are 8.69 one pair should involve regrouping

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Select the number of ways in which a line and a circle can intersect

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.