Let r be the relation on n x n defined by (a, b) r(c, d) if and only if ad bc. show that r equivalence relations. is an equivalence relation on n x n.

Factor the expression using gcf 9b+45

Write an inequality for this sentence the quotient of a number and -5 increased by 4 is at most 8

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte