book Maths Puzzle Numerical Ability

The directions say to solve the system
r-s=-3
r+s=9

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book Other Question

Let f(x) = 2x^2 - 4x + 1 and g(x) = 3x + 2 and evaluate each of the following:

g(f)

f[g(0)]

f[g(1)]
what is the prime factorization of the number 1313