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a level maths core 3

A river is 30 metres wide in a certain region and its depth,d metres, at a point x metres from one side is given by the formula d=1/60[(x(30-x)(30+x) to the power of 1/2].
(a) use simpsons rule with 6 intervals to estimate the cross-sectional area of the river in this region,giving your answers to 3 significant figures.
(b) given that in this region, the river is flowing at a uniform speed of 50 metres per minute, estimate the number of cubic metres of water passing per minute.
i dont know where i keep going wrong.
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Original post by faisa12345
A river is 30 metres wide in a certain region and its depth,d metres, at a point x metres from one side is given by the formula d=1/60[(x(30-x)(30+x) to the power of 1/2].
(a) use simpsons rule with 6 intervals to estimate the cross-sectional area of the river in this region,giving your answers to 3 significant figures.
(b) given that in this region, the river is flowing at a uniform speed of 50 metres per minute, estimate the number of cubic metres of water passing per minute.
i dont know where i keep going wrong.


Could you post your working?

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