Which statement explains how you could use coordinate geometry to prove that quadrilateral ABCD is a square? Shape ABCD is shown. Point A is at negative 3, 5. Point B is at 1, 7. Point C is at 3, 3. Point D is at negative 1, 1.

Prove that all sides are congruent, and the slopes of consecutive sides are opposite reciprocals
Prove that segments AD and AB are congruent and parallel
Prove that opposite sides are congruent and that the slopes of consecutive sides are equal
Prove that segments BC and CD are congruent and parallel

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0