Mathematics, 25.09.2019 11:30, homework1911

Ben is 3 times as old as daniel and is also 4 years older than daniel.
how old is ben?

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Mathematics, 21.06.2019 21:00, Anybody6153

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Mathematics, 21.06.2019 22:00, lalanduni

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Mathematics, 21.06.2019 22:40, raymond5799

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Mathematics, 21.06.2019 23:10, ylianafghgfdsnm1479

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?