The expression comes from sequences. Given a sequence U1, U2, U3, ... the first differences are (U2 - U1), (U3 - U2), (U4 - U3) and so on.
If you consider these as the sequence V1, V2, v3, ... then the second differences in U are the first differences in V. So the second diffs are:
V2 - V1 = (U3 - U2) - (U2 - U1) = U3 - 2*U2 + U1
V3 - V2 = (U4 - U3) - (U3 - U2) = U4 - 2*U3 + U2, and so on.
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I don't think there is a difference.
This is known as the "Difference".
add math is harder...but not particularly different in style. If you like math you'll like it more, if you don't like math this won't be any different.
when you are finished with everything what is the difference from where you started to when you ended
Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.