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# C4 Vector questions help!

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1. I am struggling to understand the mark scheme of these 2 questions

#1

Mark scheme
Attachment 552706552708
I don't understand why there is only 1 letter (k) to be multiplied into the direction vector of Line 2, am I not supposed to multiply it by (xi, yj, zk) with 3 letters instead of one?

#2
Attachment 552706552708552700
I have done everything right in this question except for part (e), I did it the hard way by using the sine rule. The easier way suggested by the mark scheme says AD=2AB, but not sure where that comes from.

Greatly appreciated if anyone can help me with these questions!! THANKS!

The questions come from Specimen paper and June 2015 (C34) if anyone's wondering
Attached Images

2. could you link the actual mark scheme?
3. (Original post by suibster)
could you link the actual mark scheme?
Sorry for the late reply, I couldn't find the second one (my bad), but here is the mark scheme for the first question: https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf
4. (Original post by ChirMu)
Thank you VERY MUCH!!!!!
5. (Original post by suibster)
could you link the actual mark scheme?
This is the mark scheme for the second question: https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf (that's number 14)
6. (Original post by QueenOfNachos)
This is the mark scheme for the second question: https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf (that's number 14)
Do you need help with number 14?
7. (Original post by ChirMu)
Do you need help with number 14?
Yes please!! Thank you!! 14e to be exact
8. (Original post by QueenOfNachos)
Yes please!! Thank you!! 14e to be exact
9. (Original post by ChirMu)
Thank you very much, Chirmu! You're a life saver
10. (Original post by QueenOfNachos)
Thank you very much, Chirmu! You're a life saver
You're welcome

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