How do i solve these problems? ? ?

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

The value of cos 30° is the same as which of the following?

Afitness center has 2 membership plans one has a low dollar sign up fee of 15 dollars and costs 38 dollars per month to join. a second plan has a higher sign up fee of 78 dollars but a lower monthly fee of 31 dollars for what number of days of the month is the coat the same