There is a snowstorm in a certain town. In 30 minutes, 78 in. of snow falls. It continues at the same rate for a total of 2 h. Which statement is true about the amount of snow in the 2-hour period? A The number of inches of snow is 2 times 74.
B The number of inches of snow is 4 times 74.
C The number of inches of snow is 8 times 78.
D The number of inches of snow is 30 times 78.
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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?