What is the end behavior of y=-2x^13+25x^8-3 as x approaches infinity?

What’s the answer answer to this question

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.

What are the values of each variable in the diagram below?