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Edexcel Maths D1

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can't remember my prims, although 860 does sound familar again. but t was so huge, yeh maybe 264 and y=3/2? P = 150 anyone remember z?

Reply 21

Zii

z was 48? I seem to remember 48. But yes, all those other numbers are exactly what I got. I remember x and s being 0. And z was a basic variable and I'm so sure it was 48.

Reply 22

John.

Armenian89

can't remember my prims, although 860 does sound familar again. but t was so huge, yeh maybe 264 and y=3/2? P = 150 anyone remember z?

Yep all of that is correct, i think z was 48.

Reply 23

Zii

Sounds like we've all done okay! How did people do on the network flow? You had to use backflow twice in order to get 19.

Reply 24

John.

Does anyone know roughly how much the flows in networks and critical path questions were worth.

Reply 25

Armenian89

anyones scheduling go horribly wrong? how many workers did you get for lower bound 4? what were your critical activites? AEHKL? or something like that

Reply 26

Zii

I remember the lower bound being 4 but you needed 5 workers?

Reply 27

Rainbow24

Gamaya

I remember the lower bound being 4 but you needed 5 workers?

yep thats what i did!

Reply 28

John.

Does anyone know roughly how much the flows in networks and critical path questions were worth!!!!!!!!!!!!!

Reply 29

Zii

Flows in networks would have been about 9 altogether, critical path about 5. So about 14?

Reply 30

Rainbow24

i think the actual flow question was 5 marks and 3 for finding the cuts?

Reply 31

Zii

Ah but then you had to prove your flow was maximal?

Reply 32

Rainbow24

yeah which was 2 marks i think...

Reply 33

John.

For the first part of the simplex questions, were the inequalities less than or, less than or equal to??? That part confused me!!

Reply 34

Zii

Less than or equal to. So thats why you have slack variables. To make them only equal to. (Slack variables could potentially = 0).

Reply 35

John.

Gamaya

Less than or equal to. So thats why you have slack variables. To make them only equal to. (Slack variables could potentially = 0).

YES!!!!!!!!!!!!!!!!!!!!!!!!!!!

Also could the objective objective function be written in the form P - Ax - By - Cy = D , or did the coefficients have to be positive? i'm sorry for all these stupid questions!