Member of the e-learning unit in Newcastle University's School of Mathematics and Statistics.

Lead developer of Numbas.

I'm happy to answer any questions - either use the Feedback button on the left or email me.

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Christian Lawson-Perfect on Find and use the formula for a geometric sequence 1 week, 3 days ago

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Christian Lawson-Perfect on Find and use the formula for a geometric sequence 1 week, 3 days ago

Saved a checkpoint:

Looks like there was an off-by-one error.

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Christian Lawson-Perfect on Solving linear simultaneous equations by elimination 1 week, 3 days ago

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Christian Lawson-Perfect on Solving linear simultaneous equations by elimination 1 week, 3 days ago

Saved a checkpoint:

You're right! I've fixed it, and improved the TeX. Worried that I let that slip by!

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Christian Lawson-Perfect on Substitute values into formulas 1 month, 1 week ago

Saved a checkpoint:

I've changed the definition of x2 to make sure the sales are always non-negative.

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Christian Lawson-Perfect on Expand brackets and collect like terms 1 month, 1 week ago

Saved a checkpoint:

I've fixed part h - I was missing a plus-or-minus in the matching pattern.

Christian Lawson-Perfect created Just one question 1 month, 2 weeks ago

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Christian Lawson-Perfect on Custom marking script for "choose one from a list" 1 month, 3 weeks ago

Gave some feedback: Ready to use