To evaluate a variable expression, you must values for the variable, and then calculate the result.

To evaluate a variable expression, you must substitute values for the variable, and then calculate the result.

Step-by-step explanation:

Evaluation of an algebraic expression basically means that we have to substitute a number in place of the variable to perform the arithmetic operations and then solve the algebraic expression to obtain the desired result.

Hence, the answer in place of the blank  is:

Substitute.

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step-by-step explanation:

the amount you'd have after the work is $1.55

step-by-step explanation:

you subtract 95% from $31.