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How does water travel up the stem of a plant from the roots to the leaves, wouldn't gravity prevent this?

Water molecules are polar. This means that one end of the molecule is slightly negatively charged (the oxygen atom) and one end of the molecule is slightly positively charges (the hydrogen atoms). The sli...

Answered by Lauren R. • Biology tutor

57017 Views

What are the characteristics for perfect competition firms and when do they make profit?

The chracteristics of perfect competition are: many firms, freedom of entry and exit, all firms produce identical or homogenous products, all firms are price takers(have no influence over the price) and h...

Answered by Diana C. • Economics tutor

5542 Views

What is de Moivre's theorem?

de Moivre worked out a brilliant and beautiful way to solve complex equations.

If you for example have z³= 1 and you want to find all real and complex z that satisfy thi...

Answered by Frederik Dahl M. • Maths tutor

2415 Views

How is the French subjunctive mood constructed?

The subjunctive mood is used in French to express several different things, such as uncertainty, hope or fear. Firstly we will look at how it is constructed: For regular verbs, we take the third person pl...

Answered by Alice J. • French tutor

2613 Views

solve for x: (x-2)(x+3)=2(2x+11)

expand the brackets to get x²-2x+3x-6=4x+22 bring all the terms to one side x²-2x+3x-6-4x-22=0 (remember:if you do something to one side, do the same thing to the other! e.g. -4x on ...

Answered by Jack R. • Maths tutor

5723 Views