Need help with a Spreadsheet style app

I was just wanting some help in working with developing an app for my iphone... i had previous experience in microsoft visual basic but i don't quite understand this code....
I am in flight school and trying to develop an app that reflects the weight an balance forms we do... I am stuck on how to do basic multiplication and division with xcode, i have viewed several videos and tutorials but they each do things differently and i can't seem to bring it together into this app.
So in the picture below.... what i need help with is how to do the following
from
aircraft weight * arm = Moment outbound
front seats * arm = Moment outbound
to fuel @ landing
"0" fuel weight = aircraft weight + front seats + rear seats+ Baggage 1 + baggage 2
If anyone has any ideas or can lend me some tip or places that deal with stuff like this that would be great

A character class [...] robs some otherwise special codes from their magic. The +, for instance, is interpreted as a plus, not as "repeat ad nauseum" anymore.
So your try [\d+] will simply match either a single digit or a single plus. The solution is to move the + outside of the character class
[\d]+
.. and in that case there is no reason anymore to create a class for just digits, as you got it already.
The period *needs* to be escaped, because otherwise it will match *any* character.
Try this for a change:
\d+\.\d+

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The links which I want to apply a different style to are contained in the Div Tag called "Footer-Navigation-Bar" .
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color: #30C;
text-decoration: none;
a:hover {
color: #F30;
text-decoration: none;
a:visited {
text-decoration: none;
a:active {
text-decoration: none;
Hello
You can see above the CSS that applies to your links. If you have links that you want to style in a diferent way, just write the rule Like this:
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color: red;
text-decoration: none;
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