There are 31 fish in a tank. The fish are either orange or red. there are 17 more orange fish. How many fish are orange? How many fish are red? Define the variables, write and solve the system of linear equations.

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.