exam Maths Puzzle Numerical Ability

did i do this right?
rounded 2 decimal places the approximate x intercept of the equation x^3+14.2x^2-4.8x-12.4=0
in standard window
i got 53.44??????????????

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exam Other Question

How do I proceed with this problem?
Find a, b, and c such that the graph of y= ax^2 + (b times the square root of x) + c goes through the points (0,3), (1,-1/2), and (4,3). Any help would be much appreciated.
Graph the system of 5x – 2y < 10, x + 2y > -2, x – y > -4
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