There are a total of 36 cars in the parking lot. 12 are blue and the rest are white. What is the ratio of blue to white cars?

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

Bring the fraction a/a-4 to a denominator of 16-a^2

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?