uh i really don't KNOW ok
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the + of a number and 10 k decreased by 4 = k-4
Replace each variables in the algebraic expression by its [known] value and calculate the value (ie evaluate) of the algebraic expression.
An algebraic term.
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.
Take the value of each variable in the expression and replace the variable by its value. Then do the math!