What is product in math.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

In the given triangle, ∠aed ∼ ∠ abc, ad = 6.9, ae = 7.2, de = 5.2, and bc = 10.2. find the measure of bd and ce. round your answer to the nearest tenth.

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take