It takes chris 30 minutes to walk to work. if he drives, it takes him 1/3 of that time. what is the latest time that chris can leave to drive to work and arrive by 8: 00?

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

(60 points) explain this in detail

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.