Different people find different things hard. So a problem that is hard for someone may seem easy to you and one that you think is hard may be easy for someone else. It is, therefore, not possible to answer the question.
I am pretty sure you can make them as hard as you want - if you have a "hard" problem, you can always find one that is even harder. If this is true, then there is no such thing as a "hardest algebra problem".
Immortality.. I supose.
900x10080
That's hard to say.
Anyone can if they work hard at it.
you Crazy! It's pi!( the number of times that diameter fits around the circumference) it still hasn't been fully defined yet.
Adobe
you can die up to 5000 times
386 times 4275=165,158ANSWER: 165,150
The hardest problem unsolved is debatable. One of the hardest problems socially unsolved is racism. People of different races and from different cultures struggle to find a solution for accepting each other as equal. One of the hardest problems unsolved in medicine is curing illnesses such as cancer. The world can be complex giving humanity a lot of hard problems to solve but by working together solutions can be found.
The hardest problem unsolved is debatable. One of the hardest problems socially unsolved is racism. People of different races and from different cultures struggle to find a solution for accepting each other as equal. One of the hardest problems unsolved in medicine is curing illnesses such as cancer. The world can be complex giving humanity a lot of hard problems to solve but by working together solutions can be found.
i have played worlds hardest game so many times and i dont think you can save your game