book Maths Puzzle Numerical Ability

what is the root of 184

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book Other Question

The amount of a radioactive tracer remaining after t days is given
by A = A0 e^–0.18t, where A0 is the starting amount at the beginning of
the time period. How much should be acquired now to have 40
grams remaining after 3 days?
What is the square root of 25a^2B^2