I've looked around a lot and all I've found is that I'm supposed to concatenate the string becuase JS is reading the + sign as just putting them together. Not adding.
var costa = calculator.costa.value;
var profita = calculator.profita.value;
var yeilda = calculator.yeilda.value;
var answer = Math.abs((costa + profita) / yeilda);
calculator.ans.value = answer;
The variable I'm having the trouble with is ANSWER. costa and profita are supposed to be added together, not just put next to each other.
Here is the calculator: http://qualitygrainservices.com/calc.php
I hope I gave enough information for everyone to sorta know what I'm having trouble with. If not please say something so I can give you more!