exam Maths Puzzle Numerical Ability

For the function defined by f(x)=2-x^2, 0<x, find a formula for f ^-1(x).

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exam Other Question

The mean of 21 test score is 78. What mean score must three additional students acheive so that the mean for all 24 students is 80. How many gallons of a 0% solution must be mixed with 60 gallons of 5% solution to obtain a 3% solution?