Find the sum of the geometric series 1/125+1/25+1/5+...+25

At which value in the domain does f(x) =0?

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.

I’m stuck on this equation, anyone got the answer?