Can someone please help me

Chemistry balance then what type of reaction are they i don't know why it keeps saying math when i put chem

What is 1.5% of 120 or what number is 1.5% of 120

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.