exam Maths Puzzle Numerical Ability

I want to know anything about roots of real numbers/properties of radicals please.

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exam Other Question

the temperature rose 40 degree celsius in the early afternoon and dropped by 8 degree celsius in the late afternoon.what was the temperature by late afternoon? Use the strategy of indirect reasoning to justify each of the following:
A. if the product of 2 positive numbers is greater than 82, then at least one of the numbers is greater than 9.

I know its not true but I dont know how to explain it