Stanislav Duris

Stanislav Duris commented on Combining Logarithm Rules to Solve Equations 7 years, 5 months ago

I feel like some parts in advice need a bit more explanation:

- In part a.iv) I think you should add a bit more explanation why the answer is always 0. Something along the lines that as $b^0 = 1$ then $\log_b(1) = 0$.

- In part b) at the end, "the only value for x is..." I feel should be something along the lines of "the only possible value for x is ...".

- In part c) "Laws for logarithms can also be applied to $\ln$." maybe you could add "as $\ln(x) = \log_e(x)$."

- Also, the last two lines of the advice is only right when p = 2. The right answer in advice always takes a square root rather than the appropriate root. Fix this.

There are some small mistakes in punctuation:

- Some parts are missing a blank space between the = and the gap.

- In advice, I feel like many of the commas you used are unnecesseary, for example "We need to use the rule," is followed by that rule so I would remove the comma so it flows better. You've done this correctly in part a.iii). Maybe if you want to keep the comma there, you should put comma after the rule/equation on the separate line as well, to make it stand out from the sentence. Similarly, "Subsituting in our values for x and y gives," I would remove these commas too for the same reason.

- You're missing a few full stops when your sentences finish with an equation in advice. For example, in part a) after the last line in each part i/ii/iii or last line of the whole advice, I think there should be full stops.

- In advice part b), near the end - "to write our equation as," is followed by two lines of equations. You put full stop after the first line by mistake, but it should be at the end of the second line. Just move the \text{.} to the end of that expression.

Finally, part c) asks for the answer to be put in the form $\frac{e^{a}}{b}$, but accepts answers in different forms such as ($(\frac{e^{m}}{q})^{1/p}$ or ${e^{a}}*{b^{-1}}$. I think this could be easily fixed by putting some required/forbidden strings in the string restriction for the question. I would advise trying "(e" and ")^" and "*" as forbidden strings and add "e" as a required string just to be sure. Hopefully that will fix this tiny problem.

Stanislav Duris on Using BODMAS to evaluate arithmetic expressions 7 years, 5 months ago

Gave some feedback: Needs to be tested

Stanislav Duris on Working with standard index form 7 years, 5 months ago

Gave some feedback: Needs to be tested

Stanislav Duris on Working with standard index form 7 years, 5 months ago

Gave some feedback: Has some problems

Stanislav Duris commented on Using the Logarithm Equivalence $\log_ba=c \Longleftrightarrow a=b^c$ 7 years, 5 months ago

- There is a typo in the question statement (logaTrithms).
- There should be a blank space before a Gap in all parts like you did in part b.ii) so it looks neater.
- In part c), the answer x= isn't in LaTeX as it should ($x=$).
- I feel like in part d), it would be nice to specifically state you need to choose one from each row, without it maybe some students may get confused and they may possibly only pick one from each column.

- In Advice part b) in ii), the expression that follows after "And our equation as,..." is the correct answer for part i), not part ii). You may just need to change your variables in this expression in your code for advice to variables from part ii).
- In part c), you refer to part b). I think it should say part b) with the bracket instead of just part b. Also, are you sure you want 1 to be a possible value of variable h2? It is completely up to you but I just find " $x = \sqrt[1]{a}$ " a bit confusing as the last line of the solution when h2 = 1.
- In part d), "Evaluating $e^{\lnx}$," should be "Evaluating $e^{\ln(x)}$," - you need to add brackets around x in \lnx. Hope this helps.

Stanislav Duris on Find bounds for distance and time spent running, given imprecise measurements 7 years, 5 months ago

Gave some feedback: Has some problems

Stanislav Duris on Find bounds for distance and time spent running, given imprecise measurements 7 years, 5 months ago

Gave some feedback: Needs to be tested

Stanislav Duris on Limits of accuracy in measuring weight in a gym scenario 7 years, 5 months ago

Gave some feedback: Needs to be tested