Testwiki:Reference desk/Archives/Mathematics/2012 July 22

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July 22

Texniccenter

When I type something in Texniccenter, e.g. \frac{}{} or \begin{equation}, before I finish typing it gives a suggestion. What key do I press to make it automatically use the suggestion? Enter doesn't work. Money is tight (talk) 08:19, 22 July 2012 (UTC)

Tab? 75.166.200.250 (talk) 21:41, 22 July 2012 (UTC)

No doesn't work. Money is tight (talk) 23:11, 22 July 2012 (UTC)

I don't think it did that last time I used TeXnicCenter, but if Tab doesn't work, maybe you can try Ctrl+Enter. -- Meni Rosenfeld (talk) 03:45, 23 July 2012 (UTC)

It's done that every time since I downloaded it around 2008. — Fly by Night (talk) 00:22, 24 July 2012 (UTC)

Right arrow? 75.166.200.250 (talk) 03:47, 23 July 2012 (UTC)

Ctrl+Space should do it. I had this same problem and had to google it. Rckrone (talk) 18:13, 23 July 2012 (UTC)

This worked when I tried it. I'd also always wondered how to do this. Good work Rckrone! — Fly by Night (talk) 00:22, 24 July 2012 (UTC)

Thanks Rckrone!!! Money is tight (talk) 07:41, 24 July 2012 (UTC)

Commission

A used car salesperson can be paid using two methods of commission. Method X uses straight commission of 3.4% of selling price of all vehicles sold. Method Y uses a ixed amount of ₤250 per week plus commission of 1.5% of the selling price of all vehicles sold. If the total selling price of the cars sold in each week is on average ₤20000,calculate which of the two methods of commission the salesperson would prefer. — Preceding unsigned comment added by Ommykiz (talk • contribs) 14:18, 22 July 2012 (UTC)

Which would you prefer, £680 or £550? But I don't know how to calculate a preference.←86.139.64.77 (talk) 16:05, 22 July 2012 (UTC)

Sorry, we don't do people's homework for them. Looie496 (talk) 16:27, 22 July 2012 (UTC)

Calculate the amount of money you would make with each method when the total sale is $20000. --130.56.93.112 (talk) 23:17, 22 July 2012 (UTC)

Show that the hemisphere is connected.

Show that the set $\{\overrightarrow{x}\in {ℝ}^n:||\overrightarrow{x}||=1,{\overrightarrow{x}}_n\ge 0\}$ is connected. --130.56.93.112 (talk) 23:14, 22 July 2012 (UTC)

Sorry, we don't do people's homework for them. Looie496 (talk) 01:51, 23 July 2012 (UTC)

Also, that's not a hemisphere. In 2D it's a quarter circle, and in 3D it's an eighth of a sphere. 75.166.200.250 (talk) 03:51, 23 July 2012 (UTC)

The notation is a little odd, but I think ${\overrightarrow{x}}_n$ is supposed to be the nth component of $\overrightarrow{x}$ (I would call it $x_n$). If that's correct, then it is a hemisphere. --Tango (talk) 06:56, 23 July 2012 (UTC)

Start with the definition of connectedness and see what you can find. --Tango (talk) 06:56, 23 July 2012 (UTC)