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How do you work out the mean of a set of numbers?

You find the mean of a set of data by adding up all of the values then dividing the number you get by the total numbers in the data. An example of this is: 'Find the mean of '6, 8, 9, 17' -First you add up a...
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Answered by Erin M. • Maths tutor
3840 Views

Complete the square for the quadratic expression x^2 − 8x + 7

As the coefficient (the number before) of x 2 is 1 we can start the expression with (x...The coefficient of x is -8 so we half this to complete the brackets and form (x-4) 2 ...Next the square of -4 is subtr...
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Answered by Megan B. • Maths tutor
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Consider the transition metal complex [CoCl3(CO)3]. What is a) The oxidation state of the metal centre. b) The dn configuration of the metal centre. c) The co-ordination number of the metal centre.

a) +3. Cl ligands carry a negative charge while CO ligands are neutral so the all together the ligands have a charge of -3. Since the complex is neutral overall, the metal must cancel out the charge of the l...
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Answered by Robert S. • Chemistry tutor
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What is a chiasmus and what is its purpose?

A chiasmus is a literary technique where concepts or grammatical features are repeated but in reverse order. A simple way to remember it is A-B-B-A, just like the band! For example: (Aeneid VI.102) ut primum...
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Answered by Olivia C. • Latin tutor
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f(x) = (x-5)/(x^2+5x+4), express this in partial fractions and hence find the integral of f(x) dx between x=0 and x=2, giving the answer as a single simplified logarithm.

f(x) = (x - 5) / (x + 4)(x + 1) let f(x) = A / (x + 4) + B / (x + 1) so (x - 5) / (x + 4)(x + 1) = A / (x + 4) + B / (x + 1) then multiplying by (x+4)(x+1), we get x - 5 = A(x + 1) + B(x + 4) x - 5 = Ax + A ...
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Answered by Toby S. • Maths tutor
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