A square flower bed has an area of 169/36 square yards. what is the perimeter of the flower bed?

Write the expression 7x^3-28xy^2 as the product of 3 factors

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

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?