exam Maths Puzzle Numerical Ability

Can you please help me solve this equation? I appreciate all your help here.

4/a^2-1 / 1/2a+2 (divide)

Thank you in advance for all your help.

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exam Other Question

Solve by graphing.Tell wheter system is independent,inconsistent,or dependent.

2x- 3y = 12

3y - 2x = - 12 The height ,h, in metres reached by a ball thrown into the air t seconds is given by the formula h=80+49t-4.9t^2. How long does it take the ball to reach its maximum height ?