Thanks for the help, the book I am using to learn pearl said chomp removed new lines, but I didn't realize that it added newlines to all of my <STDIN> tags.
I apologize for the formatting, I was getting frustrated with my code and didn't take the time to look up proper formatting in perlmonks, so thanks for the link!
This is what I now have:

#!/usr/bin/env perl
print "Please enter your first name:";
chomp ($FIRST = <STDIN>);

print "Please enter your last name:";
chomp ($LAST = <STDIN>);

print "Please enter a temperature in Farenheit:";
chomp ($F = <STDIN>);

chomp ($C = (($F - 32) * 5) / 9);

print "Thank You $FIRST $LAST, $F degrees Farenheit is $C degrees Cels
+ius.\n";
[download]

And this is what I got:

nova> perl project1.pl
Please enter your first name:neg
Please enter your last name:zero
Please enter a temperature in Farenheit:90
Thank You neg zero, 90 degrees Farenheit is 32.2222222222222 degrees C
+elsius.
nova>
[download]

It worked great! Thanks for everyone's help!