Which of the following terms is synonymous with the word 'plus' in mathematics?

The term 'plus' in mathematics signifies addition, representing the action of combining numbers or quantities together. When we look at the given options, each term relates to the idea of incorporation or enhancement that aligns with the concept of addition.

The phrase 'total of' captures the essence of summing values to yield a larger quantity. When you take multiple numbers and combine them, the result is indeed their total, which inherently involves the operation 'plus'.

The term 'combined' refers to the act of bringing together different numbers or amounts, paralleling the addition process. When numbers are combined, they undergo the addition operation, reinforcing the synonymy of this term with 'plus'.

Similarly, the phrase 'increased by' indicates that a certain amount is being added to another quantity. This directly corresponds to the mathematical operation of addition where one number is augmented by a specified amount, again reflecting the process signified by 'plus'.

By understanding that each of these phrases represents different facets of the addition operation, it becomes clear that all of them are synonymous with the word 'plus'. Therefore, the option that states 'all of the above' accurately captures this relationship, making it the correct choice.