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How do I write about historiography in an essay?

A Levels may be the first time you have to write about historiography in a history essay, it was for me! However, it is not as daunting as it may first seem and I would recommend you practice a few historiog...
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Answered by Samar A. • History tutor
8173 Views

Find the tangent and normal to the curve y=(4-x)(x+2) at the point (2, 8)

-Tangent is a straight line that touches, but does not intersect, the curve at the point (2,8). We need to find the gradient of the curve at the point (2, 8). To do this, expand the equation, differentiate i...
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Answered by Sam E. • Maths tutor
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A curve C is defined by the parametric equations x=(4-e^(2-6t))/4 , y=e^(3t)/(3t), t doesnt = 0. Find the exact value of dy/dx at the point on C where t=2/3 .

To solve this we must use the chain rule which is dy/dt * dt/dx. Firstly, we differentiate dy/dt. For this we must use the quotient rule, this gives us dy/dt=(9te^3t - 3e^3t)/9t^2. Now for dx/dt, by substitu...
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Answered by Lauren K. • Maths tutor
6737 Views

What is electronegativity?

Simple definition: Electronegativity is the tendency of an atom to attract a bonding air of electrons to itself
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Answered by Adam R. • Chemistry tutor
3567 Views

How do I explain the process of Natural Selection?

VOSSAG V - Variation: all organisms undergo varying amounts of genetic variation due to genetic mutations or environmental factors (such as geographic separation). O - Overpopulation: all populations have th...
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Answered by Ben K. • Biology tutor
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