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What is the best way to revise for a Maths A-level?

The best method to revise is through solving past questions and timed exam papers. As long as you have your notes and understand all the basic principles, then you just need to practice in order to avoid get...
AE
Answered by Ayah E. • Maths tutor
8928 Views

Integration by parts: Integrate the expression x.ln(x) between 1 and 2.

Let $ denote the integral symbol, as I am limited here by my keyboard. Recall the formula for integration by parts: $ u.(dv/dx) dx = uv - $ u(dv/dx) dx So to find $ pi 0 x.sin(x) dx, we must allocate x and s...
RH
Answered by Rebecca H. • Maths tutor
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Describe the mechanism of transport in the phloem, involving active loading at the source and removal at the sink.

The active transport of hydrogen ions out of the companion cells using ATP creates a hydrogen ion gradient.This causes the facilitated diffusion of H + ions back into companion cells. This occurs through a c...
JC
Answered by Jonathan C. • Biology tutor
23257 Views

Write a balanced equation for the reaction of calcium hydroxide with nitric acid.

Ca(OH)2 + 2HNO3 --> Ca(NO3)2 + 2H2O
JC
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How far is the point (7,4,1) from the line that passes through the points (6,4,1) and (6,3,-1)?

To begin with, we should find the equation of the line. To do this we appoint a position vector and a direction vector. The position vector can simply be one of the two points we are give, i.e. (6,4,1). To f...
RH
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