Chris Graham

Chris Graham on Discrete and continuous data 8 years, 5 months ago

Gave some feedback: Ready to use

Chris Graham commented on Discrete and continuous data 8 years, 5 months ago

Very nice question. I've just made some very minor changes to the advice wording. 

Chris Graham on Addition and subtraction of fractions 8 years, 5 months ago

Gave some feedback: Ready to use

Chris Graham commented on Addition and subtraction of fractions 8 years, 5 months ago

I've made some very minor changes to the advice. Looks good now.

Chris Graham on Use the quadratic formula to solve an equation in terms of an unknown variable 8 years, 5 months ago

Gave some feedback: Has some problems

Chris Graham commented on Use the quadratic formula to solve an equation in terms of an unknown variable 8 years, 5 months ago

When the variable C_2 is zero, your advice states $c = 0k^2$, which caused me great confusion (about where the $k^2$ had come from) when I was unlucky enough to generate this on my first attempt. If you would like to keep this scenario, then you will need to adjust the advice, or if it is not desirable then use an except in the generation of B_2 or n2. 

Chris Graham commented on Find the equation of a line through two points - negative gradient 8 years, 5 months ago

Good work with the adaptive axis ranges, however in some cases the x axis is objectionably at edge of the board, as the maximum of the y range evaluates to 0. Use the javascript function Math.max() to set a minimum range displayed above the axis, e.g. Math.max(yb+4,2) would set the 'y-max' to a minimum of 2.

You could use a similar method to check that the intercept is on the board (it currently isn't always).

Check your spelling, e.g. "coordiantes" and that your sentences read fluidly, e.g. "find the straight line equation of the line running through these points" can be written "find the equation of the straight line running through these points" and so on.

Chris Graham on Find the equation of a line through two points - negative gradient 8 years, 5 months ago

Gave some feedback: Has some problems

Chris Graham on Completing the square 8 years, 5 months ago

Gave some feedback: Has some problems

Chris Graham commented on Completing the square 8 years, 5 months ago

You seem to have sorted the pattern matching and there is a nice gradient of difficulty now.

In the part prompts, replacing e.g. "the expression" with "the following expression" will be clearer to the student.

I would suggest that part (d) becomes its own question, and then you could split this into two parts: the first part completing the square and the second finding the solutions.