exam Maths Puzzle Numerical Ability

simplify (3x^3yz^-1)/(-12xy^-2z^2)

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87.Money is invested in a savings account at 12% simple interest.After one year there is $1,680 in the account.How much was originally invested? How do I evaluate each function for the value specified.

f(x) = x 2 - 7x +10; find (a) f (0), (b) f (5), and (c) f (2).