What is 0.26 repeating (.26 reappearing) as a fraction in simplest form?

What is the value of x in the diagram below?

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)