exam Maths Puzzle Numerical Ability

i dont know where this question should be posted Q. A certain isotope has a decay rate of-1.5% find its half life
thank you

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what values are excluded from the domain of the function
a)f(x)=5x+1
b)g(x)=x-4y=8
A computer store sells 10 floppy diskettes for $15 and 30 diskettes for $40. Assume that the number of dollars varies linearly with the number of diskettes.
Write the particular