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What is Pythagoras' Theorem and how do you use it?

Pythagoras' Theorem: a² + b² = c² where a, b, c relate to the sides of a right-angled triangle, and c is the hypoteneuse.

Use the equation to find the length on...

Answered by Hermione S. • Maths tutor

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Why do some verbs take 'avoir' as the auxiliary whilst others take 'être'?

The vast majority of verbs use 'avoir' as an auxiliary. However a few take être. These verbs are mostly verbs which communicate a state or motion. Just remember MRS VANDERTRAMP Monter Retourner Sortir Ven...

Answered by Joseph K. • French tutor

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Describe how the forces change on a parachutist while they fall.

It is important to remember that there are four main concepts to keep in mind while thinking about the parachutist. To remember them, it might be helpful to use the acronym GADE: Gravity, Acceleration, Dr...

Answered by Nicholas D. • Physics tutor

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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...

Answered by Robynne N. • Biology tutor

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