exam Maths Puzzle Numerical Ability

How do you find the value for k so that 9m^2-kn^2 will have the factors 3m+7n and 3m-7n

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exam Other Question

The amount of a radioactive tracer remaining after t days is given
by A = A0 e-0.058t, where A0 is the starting amount at the beginning of
the time period. How many days will it take for one half of the
original amount to decay?
-5-4x=7x-6