exam Maths Puzzle Numerical Ability

solve for x: 3x^2+4x-9=0

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Martha asked George if he could construct a 4 inch circle with a straight edge and a compass. George said he could. Martha asked George to do it. Could he? Why or why not?
The volume of a cube is given by V = s^3, where s is the length of a side. Find the length of a side of a cube if the volume is 800 cm^3. Round the answer to three decimal places