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Explain how eutrophication can lead to the death of aquatic organisms? (6 marks)

1 - Fertilisers (eg NPK) used in agriculture are washed into local water sources such as rivers and lakes by rainwater/surface run off 2 - These nutrients enable algae to grow, leading to the formation of al...
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Answered by Amy W. • Biology tutor
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What are the definite articles in Italian and how do I know which one to use?

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Answered by Penelope S. • Italian tutor
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how do i calcualte the length of an unknown side of a right angled triangle

To calculate the length of the unknown side you must know the lenght of two of the other sides of the right angled triangle. if we know this we can use pythagoros thereom. The equation for this is a^2+b^2=c^...
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Answered by Callum L. • Maths tutor
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If f(x) = x^2 - 3x + 2, find f'(x) and f''(x)

f'(x) is the first derivative of f(x) therefore f'(x) = 2x - 3 To find f''(x) simply take the derivative of f'(x), therefore f''(x) = 2
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Answered by Peter O. • Maths tutor
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Solve the simultaneous equations 3x + 2y = 4 and 4x + 5y = 17

3x + 2y = 4 (equation 1) 4x + 5y = 17 (equation 2) Multiply equation 1 by 2.5, giving 7.5x + 5y = 10 (equation 1) 4x + 5y = 17 (equation 2) Subtract equation 2 from equation 1, giving 3.5x = -7 Therefore, x ...
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Answered by Isabella G. • Maths tutor
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