second or third
It is the description of a rule which describes how the terms of a sequence are defined in terms of their position in the sequence.
A grand is 100 of something. e.g. 6 grand is 600.
the line is called a division bar
Like terms
Simplifying in maths means exactly that: making it less complicated, and reducing it to the fewest terms necessary.
Symmetry
A expression in maths is a collection of terms without an equality sign.
The Maths terms combination and permutation apply in chemistry when making the expected industrial calculation.
To turn.
1st
It's 10 years.
1000 cc
A gross is 144.
because there is no mathematical terms in English and maths tends to suck anyway
For answer see http://mathsduck.co.uk/
it is across, like the horizon.
A score is equal to 20.