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A curve has the equation: x^3 - x - y^3 - 20 = 0. Find dy/dx in terms of x and y.

x 3 - x - y 3 - 20 = 0 Find dy/dx. Differentiate with respect to x. 3x 2 - 1 - 3y 2 (dy/dx) = 0Therefore: dy/dx = (3x 2 - 1)/3y 2
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Answered by Karishma P. • Maths tutor
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How does increasing/decreasing temperature affect the equilibrium position of the following reaction: CuSO4.5H2O(s) ⇌ CuSO4(s) + H2O(l) ?

The endothermic and exothermic reactions should be identified. Note: if the forward reaction is endothermic, the reverse reaction will be exothermic with the same ΔH but opposite values.In this example: the ...
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Answered by Ayesha G. • Chemistry tutor
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Literary commentary on Grace Chua's '(love song, with two goldfish)

In order to explore the concept of entrapment and the limited existence one subsequently experiences, Grace Chua uses goldfish as the embodiment of two humans who fall in love. It is through this representat...
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Answered by Olivia T. • English tutor
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The conditions at the time were more important than the methods used in the rise to power of one authoritarian leader

The political importance of the Chinese peasantry is vital in understanding Mao’s consolidation of power in 1949. It was their oppression that incited the hatred towards the Kuomintang and constituted the la...
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Answered by Olivia T. • History tutor
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Alex designs a game for people to play, using two fair five-sided spinners. A person wins the game when both spinners land on the same letter. People pay 40p for each game they play. The prize for a win in £1. Is she likely to raise money?

In order to raise money, we need the average number of wins to be smaller than the average number of losses by at least a factor of 0.4. The average number of wins will be the number of games multiplied by t...
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Answered by Megan L. • Maths tutor
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