Anyone here any good at it, im trying to plot a graph from a function, ive put everything on the page but nothing appears on the graph.

pm me if you can help thanks

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- March 16th 2009, 07:38 AMbangor_boyMathcad
Anyone here any good at it, im trying to plot a graph from a function, ive put everything on the page but nothing appears on the graph.

pm me if you can help thanks - March 16th 2009, 08:21 AMPlato
- March 16th 2009, 09:52 AMbangor_boy
A tent-shaped shelter has a ridged roof of length 3 metres and a horizontal rectangular floor of length x metres. Each end of the shelter is an isosceles triangle of slant side length 2 metres and base length 1 metre. The shelter, shown in the diagram below, is symmetric about vertical planes through the centre of the rectangular floor and parallel to its sides. The value of x is between 0 and 3

+ sqrt 15. (The shelter cannot exist for other values of x.)

The total volumeV (x)m3 of the shelter is given byV(x)= 1 /12 (2x +3)√ 15−(x −3)2 (0 ≤x ≤3+ 15).(You arenot asked to derive this formula.)For parts (a) and (b) (and for part (c), if you use Mathcad there) youshould provide a printout annotated with enough explanation to make itclear what you have done.NB:Ifyou definex to be a range variable in part (a) and wish to use x ina symbolic calculation in part (b), then you will need to insert thedefinitionx := x between the two parts in your worksheet.(a) Use Mathcad to obtain the graph of the functionV (x).(b) This part of the question requires the use of Mathcad in each sub-part.(i) By using the differentiation facility and the symbolic keyword‘simplify’, find an expression for the derivativeV (x).(ii) By either applying a solve block or solving symbolically, find avalue ofx for which V (x)= 0.(iii) Verify, by the Second Derivative Test, that this value ofxcorresponds to a local maximum ofV (x). (It should be apparentfrom the graph obtained in part (a) that this is also an overall

maximum within the domain ofV (x).)(c) Using Mathcad, or otherwise, find the maximum possible volume ofthe shelter, according to the model.

- December 2nd 2009, 03:25 PMbigroo
I'm interested in seeing a solution to this as I've just obtained a copy of Mathcad, can anyone take this any further please?

Thanks