I have two separate Ajax Post requests that i need to add together, they are both linking to a currency exchange feed, its basically two values that get converted from different
var request1 = $.ajax({ ... }),
request2 = $.ajax({ ... });
$.when(request1, request2).then(function(response1, response2) { ... })
Further reading:
A good article about how to use promises in jQuery: http://joseoncode.com/2011/09/26/a-walkthrough-jquery-deferred-and-promise/
And the official documentation pages.
Small abstract example similar to what you need (sorry, don't have enough time to create ajax requests there, but they behave exactly the same): http://jsfiddle.net/Y26zd/