Answer + ! which expression can be used to find the difference of the polynomials? (4m – 5) – (6m – 7 + 2n) a. (4m – 5) + (6m + 7 + 2n) b. (4m – 5) + (–6m + 7 + 2n) c. (4m – 5) + (–6m – 7 – 2n) d. (4m – 5) + (–6m + 7 – 2n)

Given: ab ≅ cd and ad ≅ bc prove: abcd is a parallelogram. statements reasons 1. ab ≅ cd; ad ≅ bc 1. given 2. ac ≅ ac 2. reflexive property 3. △adc ≅ △cba 3. ? 4. ∠dac ≅ ∠bca; ∠acd ≅ ∠cab 4. cpctc 5. ∠dac and ∠bca are alt. int. ∠s; ∠acd and ∠cab are alt. int. ∠s 5. definition of alternate interior angles 6. ab ∥ cd; ad ∥ bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3? triangle angle sum theorem sas congruency theorem sss congruency theorem cpctc