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A curve is given by the equation y = (1/3)x^3 -4x^2 +12x -19. Find the co-ordinates of any stationary points and determine whether they are maximum or minimun points.

Stationary points - dy/dx =0dy/dx = x 2 -8x +12 ( differentiating- early a level skill). Solving x 2 -8x +12=0 gives x=6, x=2 (solving quadratics- gcse skill). Subbing these values back into the original equ...
JC
Answered by Joseph C. • Maths tutor
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Can you explain hydrogen bonding?

Hydrogen bonding is a type of dipole-dipole interaction (dipole being when a molecule has unequal sharing of electrons across a bond). It is a particularly strong type dipole-dipole interaction and can only ...
DD
Answered by Daniel D. • Chemistry tutor
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Describe and Evaluate the Multi-store model of memory (16 marks)

The multistore model of memory is a memory model which suggests that memory is composed of 3 stores: the sensory memory store, the short term memory store and the long term memory store. Each store is encode...
LD
Answered by Lauren D. • Psychology tutor
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Outline two material factors that may affect social class differences in educational achievement.

One material factor that may affect social social class differences in educational achievement is overcrowding at home. This is because if there is overcrowding at home, which is often due to parents or guar...
KW
Answered by Katie W. • Sociology tutor
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Discuss how Twelfth Night disrupts ideas of class and status.

Twelfth Night, by nature, is a play of the world being turned upside down. This notion manifests itself in the systematic degeneration of established constructs of the medieval era in which the play was firs...
AH
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