book Maths Puzzle Numerical Ability

Find the inverse of the function
f(x)=(x-5)^2+4

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book Other Question

I hope I put this under the correct topic.

One recipe calls for 1/4 teaspoon vanilla. A second recipe requires for 1/2 teaspoon vanilla, and a third recipe calls for 1/8 teaspoon vanilla. How much vanilla is required to make all three recipes? I need to know how to find the radius and center of x2 - 2x + y2 � 16y = � 1.