determine whether each statement is true/false, and justify answer.
a) suppose that a is an invertible n\times n matrix with integer entries. if det(a) = 1 , then a^{-1} also has integer entries.
b) if a is a square matrix, then (adj(a)) = adj (a^t)

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