The number must be 0, because any other number would multiply to a different product.
A. Perpendicular!
Because they cross with a 90 degree angle :]
The answer you're looking for is s=6.
by substitution you'd get 6.
Answer:

Step-by-step explanation:
By AA Similarity, triangles ASR and EST are similar.
The ratio of the lengths of the sides of triangle ASR to those of EST is 6/8 or 3/4.

Also,

By a rule of proportions, you get




