I've solved the problem using this right here and it works perfect :)
jQuery(function(){
jQuery("input[name=investorlandlord]").change(function(){
if ($(this).val() == "I'm a Landlord") {
jQuery("#properties").slideDown()
}
else {
jQuery("#properties").slideUp();
}
});
});
jQuery(function(){
jQuery("input[name=investorlandlord]").change(function(){
if ($(this).val() == "I'm an Investor") {
jQuery("#finance").slideDown()
}
else {
jQuery("#finance").slideUp();
}
});
});