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How does water move up the xylem vessel?

Hydrogen bonds between water molecules give water a ‘stick’ like property called cohesion. This means molecules of water are attracted to each other. Hydrogen bonds also form between water molecules and the ...
RB
Answered by Rehana B. • Biology tutor
4722 Views

How do I know which verbs take être in the passé composé.

Well, the easiest way to remember this is...For almost all non-reflexive verbs, you will use 'avoir' rather than être. There are however, some exceptions. A particularly useful way of remembering which ones ...
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Answered by Marc F. • French tutor
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When an owl hears a sound, the sound will hit each of its ears at a different time because the separation between the ears results in a time delay. The neuronal stimuli triggered need to reach the audio processing centres of the brain simultaneously; *TBC

*continued;how would you design the neurones leading from the ears to the audio processing centre to ensure that the stimuli will reach it at the same time?We need to start by establishing that the signal fr...
JB
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Solve the inequality x^2 < -8x + 9

Notice that the inequality may be rearranged to give the quadratic x^2 + 8x - 9 &lt; 0.Factorise the quadratic to give (x-1)(x+9) &lt; 0.Treating the expression as an equality, recall that if the product of ...
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Answered by Isaac S. • Maths tutor
5086 Views

For any given journey, ABC Taxis charge customers a base fare of £5 plus 80p per mile. XYZ Taxis charge a base fare of £3 plus £1.20 per mile. Find the number of miles, x, that must be traveled in order for ABC taxis to be the cheaper journey option.

This question can represented in algebraic form: ABC Taxis = 0.8x + 5XYZ Taxis = 1.2x + 3 Noting that the units must be consistent throughout the question, so we have changed the pence into miles. (80p = £0....
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Answered by Euan M. • Maths tutor
3377 Views