This is a similarity question and I need help understanding how to solve 5b and 5c. Please explain how to do it, I’m confused over the question.

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.

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that