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In terms of ecological pyramids, how can pyramids of numbers sometimes be a different shape from pyramids of biomass, even for the same food chain?

Ecological pyramids are a way of visualizing a food chain, either with the mass of organisms or the total number of the population of organims at each stage of the food chain. Pyramids of biomass are always ...
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Answered by Robynne N. • Biology tutor
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Solve the equation for x: 3x^2 -5 = 22

x =3 or x= -3
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Answered by Rachel M. • Maths tutor
3999 Views

GCSE (General Approach)

My understanding of the GCSE Religious Studies criteria is that the pupil is required to demonstrate three key areas of skill: a knowledge set on at least two world religions, a personal opinion on the set o...
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GCSE: I don't understand how to rationalise denominators

First, I would make sure the pupil understands why rationalising fractions is necessary. Then I would acquaint them with the relevant vocabulary so they can express their thought process better and understan...
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Answered by Cora A. • Maths tutor
4152 Views

How to do add or subtraction fractions?

A fraction a/b consists of a numerator (the part above the bar, a in this example) and a denominator (the part below the bar, b here). In order to add or subtract fractions, we need to make sure the denomina...
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Answered by Michelle L. • Maths tutor
4436 Views