Answer:
4. (AE+EC)/AE = (AD+DB)/AD
6. AB=AD+DB
7. 4, 5, 6
Explanation:
4. Combine the fractions by putting them under the same denominator
6. AE and EC share a point E. Just remove that point E to get AC.
Do this concept with AB. AD and DB share point D. Hence AD+DB=AB.
7. In steps 4, 5, and 6, we figured out that AB=AD+DB and AC=AE+EC. Just substitute those values in the equation to get:
(AE+EC)/AE = (AD+DB)/AD ==> AC/AE = AB/AD
^^This equation was found in step 4