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Explain how the properties of water, that are essential to living things, arise from the 
dipolar nature of water

a oxygen in water ‹ slightly › negatively charged and hydrogens ‹ slightly › positive b hydrogen bonding due to the dipolar nature c water molecules are cohesive due to hydrogen bonding d cohesion useful in ...
Answered by • Biology tutor
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How should I analyse a primary source?

When approaching primary source questions it is worth remembering that the examiner needs to see you weigh up the source’s evidence in the light of your own knowledge. This is easy to do if you apply the ‘ C...
AH
Answered by Anne H. • History tutor
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Solve x^2+6x+1=0 by completing the square

x 2 +6x+5=0 First of all half the x coefficient and write (x+6/2) 2 the take away the (6/2) 2 and add on the 5 (x+3) 2 -9+5=0 (x+3) 2 -4=0 Simplify the expression (x+3) 2 =4 Move 4 to the other side of the e...
BS
Answered by Ben S. • Maths tutor
10063 Views

Find the equation of the tangent to curve y=5x^2-2x+3 at the point x=0

y=5x 2 -2x+3 Differentiate to find the equation of the gradient of the curve dy/dx=10x-2 Substitute x=0 to find the gradient at the point x=0 dy/dx=-2 y=5 0^2-2 0+3 Substitute x=0 into the original equation ...
Answered by • Maths tutor
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Explain the analogy of the divided line as an exemplary case of Plato’s epistemology

This question from an IB philosophy exam gives an opportunity to discuss Plato’s epistemology in books V – VII his Republic with a focus in one of its classical analogies: the divided line. Plato suggests th...
CH
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