The United Nations Convention on the Protection of the Rights of All Migrant Workers and Members of Their Families defines migrant worker as follows: The term migrant worker refers to a person who is engaged or has been engaged in a remunerated activity in a State of which he or she is not a national.
A mathematical expression can be as simple as 2 + 4 or as complex as -4xy + 8 x - 5(x/y). All mathematical expressions contain terms and each term has a coefficient, the numerical factor.
In multiplication, a mathematical expression is the part of the sentence that comes before the equal sign. The mathematical expression contains the factors and the multiplication symbol. For example, in the sentence 2 x 8 = 16, the 2 x 8 portion is the mathematical expression.