exam Maths Puzzle Numerical Ability

Express as a fraction and a decimal:

1. 56%

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The function y=3^x has been transformed to y=2*3(^-1/2x-1)+8. What is the mapping rule for the image of y=3^x??? I think the answer might be (x,y):(-2x+1,1/2y-8) . Can someone plea A simple pendulum, such as a rock hanging from a piece of string or the inside of a grandfather clock, consists of a mass (the rock) and a support (the piece of string).

When th