Transition to university

Christian Lawson-Perfect on Solving linear simultaneous equations by elimination 8 years ago

Saved a checkpoint:

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

Deirdre Casey commented on Find and use the formula for a geometric sequence 8 years ago

In part b does not accept correct answer. Mistake also shown in the solutions.

Deirdre Casey on Find and use the formula for a geometric sequence 8 years ago

Gave some feedback: Has some problems

Deirdre Casey on Solving linear simultaneous equations by elimination 8 years, 1 month ago

Gave some feedback: Has some problems

Deirdre Casey commented on Solving linear simultaneous equations by elimination 8 years, 1 month ago

I think there is a sign error in the second equation in part b.

Christian Lawson-Perfect on Substitute values into formulas 8 years, 1 month 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, 1 month ago

Saved a checkpoint:

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

J. Richard Snape commented on Substitute values into formulas 8 years, 2 months ago

Part (b) uses the random variable n={0..4}, but that can give negative sales in a year which doesn't make much sense.  I think that the variable definition has been copied over from a different word type question and should actually be allowed to run {2..5}

J. Richard Snape commented on Expand brackets and collect like terms 8 years, 2 months ago

Thanks for this fantastic question set in "Transition to University".  I'm trialling using them in my teaching this year.  I have a tiny problem with part h in this question - for some reason when I use it when a student enters a correct answer it marks it wrong, giving feedback that it can be further simplified.  I attach a screenshot - not sure what rule is triggering this as even the 419 constant is prime, so I can't see any further gathering of terms possible.  I'll try to debug myself, but any help would be appreciated :)  It seems to be using "all" for simplification in the marking, but so are other parts in this question that work fine.

Chanselvie Dimuene on Percentages and ratios - box of chocolates 8 years, 2 months ago

Gave some feedback: Ready to use

Chris Graham commented on Calculate the measures of central tendency for a sample 8 years, 3 months ago

Moved the list of answers into a table, to make the formatting more consistent with similar questions.

Christian Lawson-Perfect on Consumer mathematics 8 years, 3 months ago

Gave some feedback: Ready to use

Christian Lawson-Perfect on Probability 8 years, 3 months ago

Gave some feedback: Ready to use

Christian Lawson-Perfect on Calculate measures of central tendency and spread 8 years, 3 months ago

Gave some feedback: Ready to use