Reviewing Potential Errors

Jul 2019

I was wondering if anyone is able to check over a major assignment I have completed, and point out any errors I may have made. I am fairly confident it is all correct, but if someone can give it another once over that would be great. If you're not able to do this, is it okay if you can check over 2e), 6c) and 5f) at least. The questions follow along with each other, so I have attached a link with each page of the assignment (it is six pages long) that will open in another browser.

With 2e) - I have written that it is reflected on the x-axis. Is this the correct terminology, or would it just be "on its axis"?

With 5f) - I am new to using derivatives so am not sure on this one.

With 6c) - I am concerned whether the answer is either 113.2m or 113.3m. I put 113.3m, but this is with using the previously rounded values in my distance formula. Would I have to use the original non-rounded values in it for it to be correct?

LINK TO ASSIGNMENT: Assignment.pdf?dl=0

Greatly Appreciated and Kind Regards :),


Forum Staff
Dec 2006
In many places, I had difficulty in reading your handwriting. Can you provide typed answers?

Question 1 seems to be answered correctly.

Question 2. a) is answered correctly.

For question 2. b), your answer needs improvement, as "narrower" is too vague. Narrower than what, and how much narrower?
The "2" is a vertical scale factor in relation to the line y = -5. There are various ways to use that fact to describe the effect of the "2" more precisely.

I couldn't read your answers for parts c) and d) of question 2.

For question 2. e), the graph would be reflected in the line y = -5.

For question 2. f), your answer might well be accepted, but a shorter explanation would suffice to earn the 1 mark available. I couldn't read all of your answer.

For question 3. d), the graph should be sketched better (its curvature is inaccurate and the turning point is positioned inaccurately).

For question 4. c), the sketch needs improvement (the intercepts are correct, but the curvature is very inaccurate and you didn't label two of the stationary points).

Your work for question 5 is probably okay, as the final values you found are correct.

I didn't check your answers for question 6, but it's unwise to use rounded answers for the calculation of further answers (in case the rounding errors accumulate too much).