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A circle has equation x^2 + y^2 - 8x - 10y + 5 = 0, find its centre and radius

To find the centre and radius of the circle, you need to get the equation into the form (x - a) 2 + (y - b) 2 = r 2 . You can do this by rearranging to bring the x and y parts together, and completing the sq...
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Answered by Martha B. • Maths tutor
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The volume of a cone is V = 1/3*pi*r^2*h. Make r the subject of the formula.

Answering the question by acknowledging the student understands what the question is actually asking. The subject of the formula sits by itself on one side of the equation and doesn't appear at all on the ot...
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Answered by Alice-Kate R. • Maths tutor
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How should I revise for my A-level exams? What is the best preparation?

This is different for everyone, and the best way to learn the most effective way for revision is to implement this throughout the school year. Keep up to date with your notes and practice different types of ...
Answered by • History tutor
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X is inversely proportional to Y. When X=4, Y=9. If Y=6, what is the value of X?

There are a few steps to this question. Before we can work out our value of X we will have to figure out an equation that links X and Y.Now if X were proportional to Y, then as X got bigger so would Y.We can...
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Answered by Andrew W. • Maths tutor
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Name and briefly describe four methods in which molecules and ions may pass through a cell membrane?

A. Osmosis - the movement of water down a water potential gradient through a partially permeable membrane. B. Diffusion - the net movement of molecules or ions down a concentration gradient. C. Active Transp...
Answered by • Human Biology tutor
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