Further Math Exam 1: Answers + Discussion!

[vididid]

ugh i had 6a for core and i changed it -.-

[Dan1995]

also question 9 for geometry how is it d? because if you do it using ratios of 81:36 after squaring the height and then cross multiplying to find x which i got was 80?

The ratio is 25:9 (simplified), multiply by 180 gives 500, which is the area of the cone from the shaded part up (including the shaded part). It only wants the shaded part so 500-180=320.

[Dan1995]

sorry i meant question 1

You may want to read the question again, it told you the path the bus took, it had nothing to do with what paths were possible therefore the degrees of each vertice are not relevant for this question?

[Scrono13]

Question 7 Networks, I had B. Could only make two of them planar?

[vididid]

oh shit, ugh so stupid, but thankyou

[Dan1995]

Question 7 Networks, I had B. Could only make two of them planar?

With a bit of rearranging, they can all be made planar.

[soysauce]

Can someone please explain the following questions:
Core: 4,6,8,11,13
Trig: 6,9

[Kayleejohns]

Could anyone explain why in core 12 is a?? I thought it was C, Thanks

[Sanguinne]

Graphs and relations q7 are u sure it's b??

[Dan1995]

Anyone got solutions for geo/trig and business?

Can someone please explain the following questions:
Core: 4,6,8,11,13

Geo and trig are up.

As for core:
4. Postcode counts as categorical, as does type of car and sex. Therefore 3 (D).
6.Either find your upper limit for outliers using Q3+1.5(IQR), or sketch on the calculator.
8.Back to back stemplots you need two categorical and a numerical variable, you have the numerical so you need the option that gives two categorical ones (Male and female so E)
11. Use the formula from the formula sheet d=a/si.
13.It does not increase or decrease from the lower median point and the upper median point, therefore the gradient is zero.

[Dan1995]

Could anyone explain why in core 12 is a?? I thought it was C, Thanks

Go to the 2011 examiners report and look at q12, its almost the same question.

[Lucho23]

Graphs and relations q7 are u sure it's b??

The boundaries are, in this question, the corner points.
(0,0) => given
(0,6) => 3(0)+5(6) = 30
(5,3) => 5+3 = 8
(8,0) => 8+0 = 8
So all these points satisfy all inequalities.

[Scrono13]

With a bit of rearranging, they can all be made planar.

100% sure?

[Dan1995]

Can someone please explain the following questions:
Core: 4,6,8,11,13
Trig: 6,9

Trig.
6.Use cosine rule to find angle CAB, then add it to 140 to get the bearing of C from A.
9. Explained above.

[Dan1995]

100% sure?

Yes, but which ones couldn't you make planar and I'll have a look?