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Let y = x^x. Find dy/dx.

This question is suited to A2 maths students, particularly those who are doing further maths and may be looking for a challenge. In one question it tests the students ability to use implicit differentiation,...
JG
Answered by James G. • Maths tutor
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How does Natural Selection occur?

In the population of a species there will always be a selection pressure (new predator/competitor/ presence of disease) There is genetic variation within the population so new alleles can arise due to random...
Answered by • Biology tutor
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Why does the first ionisation energy of atoms generally increase across a period?

The first ionisation energy is defined as the energy required to remove one mole of electrons from each atom of a mole of gaseous atoms. As we go along a period in the periodic table, the atomic number incre...
Answered by • Chemistry tutor
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How does DNA replication work?

DNA replication is called semi-conservative, because each original strand is used to create a new strand. In order to do this, first we need to separate the two strands: they are unwound and unzipped by the ...
ET
Answered by Ellie T. • Biology tutor
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Express as a single logarithm 2 loga 6 loga 3 [2 marks]

loga12 explantion:from simples rules of logs
Answered by • Maths tutor
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