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A circle A has equation x^2+y^2-6x-14y+54=0. Find a) the coordinates of the centre of A, b) the radius of the circle A.

The standard equation of a circle is in the form (x-a)^2+(y-b)^2=r^2, where the coordinates of the centre of the circle is (a,b) and the radius of the circle is r. Therefore, you must put the given equation ...
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Answered by Evelyn Q. • Maths tutor
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How do I draw a stem and leaf diagram?

To begin a stem and leaf diagram you will need to first order the data given to you into the question. The data in your stem and leaf must be in ascending order and grouped into tens. Draw the table separati...
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Answered by Beth F. • Maths tutor
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Describe how HIV replicates in the human body

The HIV life style has 7 stages. The first is binding: HIV has glycoproteins embedded in the membrane that help it to bind to CD4 receptors on the surface of a human cell. Next, the HIV envelope and human ce...
MM
Answered by Maree M. • Biology tutor
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Why do you want to study medicine?

There are many reasons why I want to study this subject, and it mostly stems from a few major points. First, I have a keen interest in science, particularly human biology. The scientific field fascinates me,...
CP
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Fossils can be found pyritised. Describe and explain how pyritisation occurs.

Pyritisation is the replacement of original material by iron pyrites. The environment needs to be anaerobic, where the only live organisms are sulfur bacteria. This bacteria will then use the sulfur in the e...
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Answered by Harriet G. • Geology tutor
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