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Solve the equation 3a^2+4a+1=3 for all values of a. Give your answers to 3 significant figures.

First take the 3 over the other side to make the right hand side zero, turning it into a homogeneous equation: 3a 2 +4a-2=0. Since the expression on the left hand side cannot be factorised, we have to use qu...
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Answered by Nida A. • Maths tutor
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How do I approach an Othello extract question?

Example of an extract question for Othello: “Read the extract below and then answer the question. Explore the significance of this extract in relation to the tragedy of the play as a whole. remember to inclu...
KM
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Explain how the trunk of an elephant evolved using Darwin's theory of natural selection, and then Lamarck's theory.

According to Darwin's theory, genetic variation within the population means that some elephants are born with longer noses. Longer noses are better suited to the environment, so longer-nosed elephants are mo...
KP
Answered by Katie P. • Biology tutor
32423 Views

Give the characteristics of a homolgous series.

A homologous series is a group of compounds that share the same functionl group. Members of the same series have similar chemical properties and show a gradation in physical properties. Each member differs f...
JW
Answered by Jessica W. • Chemistry tutor
3354 Views

Explain the process of natural selection.

Mutation, meiosis and sexual reproduction causes variation amoung members of the same species. Species tend to produce more offspring than the environment can support leading to competition for food or preda...
JW
Answered by Jessica W. • Biology tutor
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