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If the velocity of a particle is given by t^2+t, then determine the acceleration of the particle when t=4.

To get from velocity to acceleration, you must derivate the velocity equation. This is because acceleration is the rate at which velocity changes so to change the velocity into acceleration it must be derive...
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How do I check if events are independent (in statistics / probability)?

The sentence 'event A is independent to event B' means that the probability of A does not affect the probability of event B. In mathematical terms, this can be written as:Prob(A and B) = Prob(A) x Prob(B) So...
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Integrate Sin(2X)

-1/2 Cos(2X)
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Factorise X^2-X-20

(X+4)(X-5)
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Solve the following simultaneous equations: 3x+y=11, 2x+y=8

x=3, y=2
RS
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