Answer:
The sum of one-half and a number is more than eighteen.
The sum of one-half and a number is greater than eighteen.
The sum of one-half and a number is above eighteen.
Explanation:
An inequality is when two expressions are not equal and the relationship could be greater than or less than. In this case, the sign > indicates that the expression 1/2+k is higher than 18. So, the phrases that can be used to represent this are the ones that contain the words more than, greater than and above that convey the meaning that the sum of one-half and a number is higher than 18.