How many pounds of brazilian coffee costing $ 6 per pound must be mixed with 27 lbs of columbian coffee costing $ 4 per pound to produce a mixture costing $ 4.5 per pound.

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According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)

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?