At 7 p. m. last night, the temperature was 10 degrees. at 7 a. m. the next morning, the temperature was -2 degrees. a) by how much did the temperaturechange from 7 p. m. to 7 a. m? b) the temperature changed by a steady amount overnight. by how much did it change each hour?

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?