exam Maths Puzzle Numerical Ability

For the function by f(x)=2-x^2, 0<x or equal to, use a sketch to help find a formula for f^-1(x).

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exam Other Question

1. An owner of a gourmet food store has two varities of herbal tea, one that cost costs $4.00 per kilogram and another that cost $5.00 per kilogram. how many kilograms of each type are needed to make 20 kg of a blend worth $4.60 per kilogram? perform the indicated operation involving rational expressions:
2x+14/x^2+14x+49
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11y x^2+2