Recent content by prehisto

Hi, thanks for your reply. Now i understand that node=vertex but why do you think that there should be separation between a node from which there are no outgoing arrows and a node to which there are no incoming arrows? My graph consists of nodes where edges are incoming as well as outgoing. I...

Homework Statement hello, I have this graph and i have to figure out these so to speak characteristics. 1) find incidence matrix 2) arrange peak according to rank and layers 3)draw new arranged graph 4) find new connection matricies of peaks and arcs Homework EquationsThe Attempt at a...

Thanks . it seems that graphically is not such a good idea because of the scale of graphs. Although it seems that it will be nasty, I will try to do it numerically by pivot point method ( if it is the correct notation).

I have another Idea , maybe I can solve ir using Simplex method. 0,2x+0,1y<=40 0,1x+0,3y<=60 1,2x+1,5y<=371,4 and maximize 6x+8y ?

Homework Statement Hi, this is my data and problem. [PLAIN]http:// Homework EquationsThe Attempt at a Solution So I am thinking that I can use system of equation to get the number of tables and closets for given resources. 0,2x+0,1y=40 0,1x+0,3y=60 1,2x+1,5y=371,4 But this does not include...

You mean x(-x2+61/2 x+700)? If I solve -x2+61/2 x+700 I also get x values which do not comply with the condition

If i do this, I end up getting x =14,7 that means y= -4,7 which does not comply with the condition that both numbers should be positive.

Yes, thank you for hint and already solved these problems,but i have another one which is a bit confusing. I have to find 2 positive numbers x+y=10 in such way x^2/2 +y^3=0 is the least. I plotted both functions and they have a cross point only when y is negative (15;-5). Should i plot x+y=10...

I rely do not understand the distinction between precalc an calculus. I just assumed that this is not "advanced" mathematics. I know derivatives, integration and differential solutions. I just don't understand how to solve this kind of problems.

Yes,I can

Homework Statement I have a series of problems 1.problem. When this number is summed with its square. The summ is the least possible. 2.problem Find positive number which substraction with its third power would be the greatest. 3.problem Find to numbers which x+y=5 but multiplication is the...

From my research on internet regarding this problem, I have the same opinion. But this example comes from school ( in topic elector magnetic waves) and therefore there should be some kind of simple answer.

Homework Statement Radar (radio wave) is placed 35m above sea level. Calculate working range of radar. Homework Equations So I have found various different formulas for range but they all are very complicated with respect to my example. I only have 1 known variable - height. The Attempt at...

Homework Statement HI, I have this photoelectric effect problem, it is not so difficult but when i got to the units and red about it , i got confused. The Problem : Photo-electrons are completely hold up by electric potential with potential of 3V. The work function is given. I have to...

jess! I completely messed up there, i need to get some sleep :D. Thank you!