Use the following information to answer #6-7: Sharon is painting a wall. The table below shows the number of hours of painting and the amount of a wall painted in square feet.

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days

Having a hard time understanding this question (see attachment).

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.