exam Maths Puzzle Numerical Ability

The area of a circle is 89.42 square inches.What is its circumference?

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Joe needs to buy a bike. The problem is, he doesnt have enough money. His friend Sam tells him that he will pay him double the money that he already has every time he jumps over a Hello I have posted this before but no reply could someone please help!
Describe and explain how you could use the graph of f (x) = 2^x to obtain a decimal approximation for (the square root of 2) .