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Practice question - How significant were the differences between the Northern and Southern states c1845? [25 marks]

Think about how to approach the question and from there think about how to structure it. Split points into differences which were significant and those that were not along with any similarities. Try to group...
BC
Answered by Ben C. • History tutor
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For a large-scale water management project, describe one cost and one benefit.

The Three Gorges Dam was built in China as a large-scale water management project. A benefit of the Three Gorges Dam is that it provides hydroelectricity to the surrounding area. A cost of the Three Gorges D...
AB
Answered by A B. • Geography tutor
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What does the strength of lattice enthalpy of formation depend on?

So, lattice enthalpy of formation is defined as the 'standard enthalpy change when one mole of an ionic crystal lattice is formed from its constituent ions in gaseous form '. The strength of this lattice dep...
ZA
Answered by Zaynab A. • Chemistry tutor
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Write 16× 8^2x as a power of 2 in terms of x.

16 = 2 4 8 2x = (2 3 ) 2x = 2 6x Therefore, 16x8 2x = 2 4 x 2 6x = 2 4+6x
XY
Answered by Xixi Y. • Maths tutor
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A curve has equation y = 20x −x^2 −2x^3 . The curve has a stationary point at the point M where x = −2. Find the x-coordinate of the other stationary point of the curve.

dy/dx = 20 - 2x - 6x 2 = -6x 2 - 2x + 20 which factorises to dy/dx = (10 - 6x)(2 + x). This shows that x=-2 and x=10/6=5/3 are stationary points of y = 20x −x 2 −2x 3 .
XY
Answered by Xixi Y. • Maths tutor
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