An expression cannot contain only coefficients; a coefficient inplies the presence of a variable as well. If all variables are removed, only constants may remain and are usually grouped into a single constant.
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A expression that only contains numbers is a Numerical
In the expression '15b + 23b + 10', the coefficients are 15, 23, and 10.If you simplify the expression to '38b + 10", then the coefficients are 38 and 10.
A rational algebraic expression is the ratio of two polynomials, each with rational coefficients. By suitable rescaling, both the polynomials can be made to have integer coefficients.
-5 & 3
Three.