exam Maths Puzzle Numerical Ability

Graph the compound function below on the axes at right.
y=f(x)={3 , -1 <= x <=2}
3x+1, x > 2

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Solve the following equations

{{{a-1 over a^2 - 4 plus 1 over a - 2 equals a + 4 over a + 2}}}

{{{x^2 + 7x + 12 over 2x + 6 times x over x^2 - The equation h=-16t^2+112t gives the height of an arrow, shot upward from the ground with an initial velocity of 112ft/s, where t is the time after the arrow leaves the ground. Find the time it takes for the arrow to reach a height of 180ft.