In the number: 5i, 5 is called the coefficient of i.
the number next to a variable that multiplies the variable
It is its coefficient
It is the coefficient of the unknown variable.
It is the number that multiplies the unknown variable
A constant. * * * * * The expected answer is more likely to be "coefficient".
We call a number that has no variable attached to it, a constant. A number attached to a variable, as in 3x, is called a coefficient.