exam Maths Puzzle Numerical Ability

eX.
Problem #4
Which of the following is not a polynomial?

A) 24
b)4X^3+5X-1
c)2X-(1)/(X)
D)3xy^2+xy

Problem#5
Simplify. Write your answer with only positive exponents.

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exam Other Question

Example: P=P0[1+r]^t

what is:
in 2009 is p1=60,943,912[1+0.9934]^(1)
in 2010 is p2=60943,912[1+0.9934]^2

I need the same answer for 2011 and 2012 please explain and show me how to figure this our. How do you subtract this rational expression: 5n/3 - 4n/3? whats the answer?