The area of a triangle is 444. Two of the side lengths are 48 and 39 and the included angle is obtuse. Find the measure of the included angle, to the nearest tenth of a
degree.

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.