exam Maths Puzzle Numerical Ability

I am in need of much help. Even though I am only in year 9. I need to know the difference between an equation and an Identity. What is the difference?
thank you if you could answer my question.

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exam Other Question

The acceleration of a particle is given by a= -9sin3t cms^-2. if the initial velocity is 5 cms^-1 and the particle is 3cm to the left of the origin, find the exact displacement aft Find the probability of drawing an ace and a jack when two cards are drawn (without replacement) from a standard deck of cards.