exam Maths Puzzle Numerical Ability

add. x/12 + 3x/12
I came up with 4x^2 - just want to make sure I am doing the steps correctly

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2. Use the graph of the related function to estimate to solutions of each equation. 0=2x^2-3
13. For each equation solve by graphing and solve using algebra. 4x^2=10 Can you help me solve: The speed of an object falling from rest in a vacuum in directly proportional to the time it has fallen. After an object has fallen for 1.5 s, its speed is