book
Maths Puzzle
Numerical Ability
The local sandwich shop has 3 cash registers. In howmany possible ways can 4 customers lineup at the registers?
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book Other Question
Working together, Joe and Jim can dig a ditch in 7 hours. Working alone, it takes Jim 2 hours longer than it takes Joe. How long will it take Joe to dig the ditch alone.
Please
Can you please help?
Two problems:
-x^2 -2x/x + 1 < 0
7x -1 / x^2 - 1 < 0