book Maths Puzzle Numerical Ability

simplify: (x^2-6x+8)/(x^2+3x-28) *(x^2+6x-7)/(x^2-3x+2)

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book Other Question

I have two word problems which I cannot decipher, please help?

1. Catrinas investment of $16,000 in an emerging market fund grew to $25,000 in 2 years. Find the average annual solve using substitution
2x + y = 4
3x + 2y = 1