Christian Lawson-Perfect
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 - email me.
Christian's activity
Christian Lawson-Perfect published My first question 7 years, 11 months ago
Christian Lawson-Perfect created My first question 7 years, 11 months ago
Christian Lawson-Perfect published Pad with leading zeros 7 years, 11 months ago
Christian Lawson-Perfect created Pad with leading zeros 7 years, 11 months ago
Christian Lawson-Perfect on Find and use the formula for a geometric sequence 8 years, 1 month ago
Gave some feedback: Ready to use
Christian Lawson-Perfect on Find and use the formula for a geometric sequence 8 years, 1 month ago
Saved a checkpoint:
Looks like there was an off-by-one error.
Christian Lawson-Perfect on Solving linear simultaneous equations by elimination 8 years, 1 month ago
Gave some feedback: Ready to use
Christian Lawson-Perfect on Solving linear simultaneous equations by elimination 8 years, 1 month ago
Saved a checkpoint:
You're right! I've fixed it, and improved the TeX. Worried that I let that slip by!
Christian Lawson-Perfect on Substitute values into formulas 8 years, 2 months ago
Saved a checkpoint:
I've changed the definition of x2 to make sure the sales are always non-negative.
Christian Lawson-Perfect on Expand brackets and collect like terms 8 years, 2 months ago
Saved a checkpoint:
I've fixed part h - I was missing a plus-or-minus in the matching pattern.