How satisfied are you with the length of passing periods and lunch periods at school? biased unbiased

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

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.

Which statement justifies why angle ebc measures 90?