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What is Pythagoras' Theorem and how is it used in exam questions?

Pythagoras' Theorem is an equation used to give us more information about right angled triangles. The theorem itself looks like this: a²

Answered by Tutor96690 D. • Maths tutor

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Explain what is meant by the term 'buffer solution' and give an example of a biological buffer system.

A buffer solution is a solution which resists changes in pH when small quantities of acid or alkali are added to it. An example of a biological buffer system would be the bicarbonate buffer system (regula...

Answered by Ruby B. • Chemistry tutor

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What did Freud mean when talking about the 'Unconscious Mind'?

Freud was a psychodynamic psychologist who developed the theory of the unconscious mind. As humans, it is believed that we only have access to a maximum of 10% of our brains and the other 90% is inaccessi...

Answered by Molly S. • Psychology tutor

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Solve the simultaneous equation 2x-4y=8 and 3x+3y=-15

Set 2x-4y=8 as equation 1, and 3x+3y=-15 as equation 2. Multiply equation 1 by 3 and equation 2 by 4 so they look like 6x-12y=24 and 12x+12y=-60. Now add the two equations and you get 18x=-36 or x=-2. Sub...

Answered by Daniel L. • Maths tutor

3497 Views

How do you find the matrix corresponding to a transformation?

Let's say that T is a transformation of the two dimensional plane. Remember that we have the two standard unit vectors (1,0) and (0,1). These are, respectively, the unit vectors pointing in the positive d...

Answered by Robin F. • Further Mathematics tutor

2329 Views