I believe you are referring to exponents that have a multiple of three. If so any number * three is a valid exponent in your case.
From the given figure, we know that:

This means that the three sides of triangle MNO are congruent to three sides of triangle LMO. Therefore, the triangles are congruent by Side Side Side postulate.
Answer:
3619.11 or 3619.1
Step-by-step explanation:
i don't really know how to explain but that's what i got
Answer: 3
Step-by-step explanation:
I estimated to 45 then divided 21 and got about 2.1