What is a real number coefficient?
A real number modifier of a variable in an expression.
A "coefficient" is any modifying value associated with a variable by multiplication. A "real" number is any non-imaginary one (a number multiplied by the square root of negative one).
So, except when dealing with complex expressions involving imaginary numbers, pretty much any 'factor' you see associated with a variable in an expression will be a "real number coefficient".
Almost al coefficients that you'll see will be real numbers. Coefficients are simply numbers in front of variables.
In the monomial
Simply put, real numbers are numbers that can be plotted along a number line, excluding any imaginary parts.
Numbers we deal with everyday like
Hope this helps!