Ava takes guitar lessons. The lessons cost $90 each month. She has 4 lessons every month. How much does each of Ava‘s guitar lessons cost?

How do i do this activity, is appreciated

What is the 12th term of b(n)=-4-2(n-1)

Solve: 25 points find the fifth term of an increasing geometric progression if the first term is equal to 7−3 √5 and each term (starting with the second) is equal to the difference of the term following it and the term preceding it.