exam Maths Puzzle Numerical Ability

Solve by even root property (x-5)^2=11

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The amount of a radioactive tracer remaining after t days is given by A=A lower case o e^-0.058t, where Ao is the starting amount at the beginning of the time period. How many days will it take for one half of he oiginal amount to decay? CAN SOMEONE PLEASE HELP ME WITH THIS PROBLEM:

IF g(x) = 3f(x) AND f(13) = 12, THEN g(13)=