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# Maths Non Calculator Mock 2017 watch

1. What did everyone get for the depth of the bowl question and how? As well as the vectors question evaluating charlie's methods? Thank you
2. the question evaluating charlie's methods was that he was wrong because he put W as 1/2 when it should have been 1/3, you just had to state this.
3. depth of bowl was 22.5
4. (Original post by debateaths)
What did everyone get for the depth of the bowl question and how? As well as the vectors question evaluating charlie's methods? Thank you
You had to complete the square
5. (Original post by CraigBackner)
You had to complete the square
Or you could use differentiation which was (for me anyway) a lot quicker
6. (Original post by honeydukes01)
Or you could use differentiation which was (for me anyway) a lot quicker
how would you differentiate it?

btw the curve of the cross section has the equation y = (x^2/10)-3x and you need to find the depth of the bowl
7. (Original post by honeydukes01)
Or you could use differentiation which was (for me anyway) a lot quicker
also how many marks did you get?
8. (Original post by CraigBackner)
also how many marks did you get?
y=(1/10)x^2-3x
dy/dx=(2/10)x-3

At minimum point, dy/dx=0
0=(2/10)x-3
2x=30
x=15

Sub x=15 into equation:
y=-22.5
Therefore depth of bowl=22.5

I got all 4 available marks on that question
9. Thank you. Are there any other difficult questions that you remember the answer to (I can't remember them specifically)
10. Thank you. Are there any other difficult questions that you remember the answer to (I can't remember them specifically)

(Original post by honeydukes01)
y=(1/10)x^2-3x
dy/dx=(2/10)x-3

At minimum point, dy/dx=0
0=(2/10)x-3
2x=30
x=15

Sub x=15 into equation:
y=-22.5
Therefore depth of bowl=22.5

I got all 4 available marks on that question
12. (Original post by hamagl231)
The question (in question) was from mock set one.

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