exam Maths Puzzle Numerical Ability

I need help solving these questions please
4+square root 7 divided by 2
exponent4 suare root 27

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exam Other Question
The number of grams of a certain radioactive substance present at time t is given by the formula A = 100e^-0.002t, where t is the number of years. Find the number of grams that are present at time t = 0 and time t = 300
Thank you for your help Find the sum or difference. 1 3/4 - 4 3/14








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