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Solve the simultaneous equations x + y = 1 , x^2 -2xy+y^2=9

So here we want to eliminate one variable so we are only working with either x or y by themself, so to do this we can rearrange the first equation of x+y=1 to x= 1-y. This new equation can therefore be subst...
BS
Answered by Belinda S. • Maths tutor
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Define the term ‘public good’ and explain why public goods suffer from the ‘free rider’ problem.

A public good is a good that is both non-rivalrous and non-excludable. Non-rivalrous can be defined as “consumption by one person does not reduce the amount available to other people” and non-excludable as “...
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Answered by Belinda S. • Economics tutor
6942 Views

How are the alveoli adapted to allow efficient gas exchange within the lungs?

The efficiency of gas exchange across a surface is determined by Fick's Law. Fick's Law states that, for the diffusion of a gas to be efficient, three conditions should be met. Firstly, the surface area of t...
OP
Answered by Olivia P. • Biology tutor
26293 Views

Why do I have to study research methods? Why can't I just look at interesting case studies?

Although they can be tedious to get your head around, research methods are a fundamental part to Psychological research. Psychology is forever pushing the boundaries with ethics when it comes to research, an...
KF
Answered by Kelly F. • Psychology tutor
2518 Views

Describe what is meant by a modular design and state on advantage of a modular design.

A program which is dividied into self-contained modules which can be further subdivided into smaller modules. They can be written and tested individually. Advantages are: Can be reused in other programs. Can...
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Answered by Emanuel D. • Computing tutor
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