exam Maths Puzzle Numerical Ability

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) .

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exam Other Question

The area of a circle is 89.42 square inches.What is its circumference? please help. solve by substitution: y=2x
x-y=4