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Describe the mechanism of mammalian breathing.

The process of breathing is made up of two components: Inhalation Exhalation Inhalation is the process of filling the lungs with air. As they fill they expand and so the rib cage moves upwards and outwards. ...
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Answered by Rebecca R. • Biology tutor
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Solve the simultaneous equations: 3x+2y=4 and 2x+y=3

When solving simultaneous equations there are several options, the two most common methods being substitution and elimination. For this example I shall use elimination. In order to do so, either x or y must ...
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Answered by Catherine G. • Maths tutor
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Explain the use of the quadratic formula to solve quadratic equations.

To explain this to a student, I would start by explaining the general formula for a quadratic equation, (ax^2 + bx + c = 0). Then I would show using an example, how the a,b and c can be substituted with numb...
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Answered by Tom N. • Maths tutor
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Why is 2-trichloroethanoic acid such a strong acid?

Cl is very electronegative, which makes it electron withdrawing. This means the three Cl substituents pull electrons from the O-H bond. This causes further polarisation of the O-H bond, which means there is ...
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Answered by Lucy S. • Chemistry tutor
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Which is the more powerful between a parliamentary and presidential system of governmentt?

Before answering this question it is necessary to consider the three branches of government: the executive, judiciary and the legislature. This enables us to evaluate the checks put on those in power, and th...
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