NEED HELP LOL if i have an 80% in a class for the first semester and a 90% in a class for the second semester, what is my grade for the year?

Find the measurement of angle b in the following triangle

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

If f(x) = 5х – 2 and g(x) = 2х + 1, find (f – g)(x).