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How can we calculate the maximum and minimum points of a function?

The derivative of a function in a point is, by definition, the slope of the tangent line to the function in that point. In a point that is a maximum or a minimum, one can easily picture that the tangent is f...
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Answered by Francisco T. • Maths tutor
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How is the relationship of mind and body pictured in Descartes? Is such position tenable?

Descartes argues that there is a fundamental essential difference mind and body. The mind is characterized as a res cogitans: it is that which thinks, its characteristic action is thought, it has no extensio...
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Are there modal verbs in Spanish? How can modality be expressed in Spanish?

In Spanish there are no proper modal verbs, but we use what we call 'perífrasis verbales modales'. These are constructions involving an auxiliary verb conjugated and a main verb in a non-conjugated form (in ...
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Answered by Francisco T. • Spanish tutor
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suggest and explain two ways the cell-surface membranes of the cells lining of the uterus may be adapted to allow rapid transport of nutrients

The membrane is folded therefore has a larger surface area for transport of nutrients by active transport and diffusion. Also, the membrane has a lot of protein carries in the membrane that are used for acti...
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Answered by Anna S. • Biology tutor
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Explain why the number of organisms typically reduces along a food chain

The number of organisms reduces because between each level of the food chain about 10% of energy is lost through movement, through not the full organism on the previous level being eaten as bones and hair ar...
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Answered by Anna S. • Biology tutor
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