a diver jumps off a boat 3 meters above the water and descends to a depth of 18 meters below sea level how for is he from the top of the boat write an expression then solve

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.