Final answer:
The value of the expression 2 + a + 15 is a + 17 after simplifying by adding the constant terms. To find the total value, the value of 'a' must be known and substituted into the expression.
Step-by-step explanation:
The value of the expression 2 + a + 15 cannot be determined precisely without knowing the value of the variable a. However, we can simplify the expression by combining the constant terms.
To simplify the expression, add the constants 2 and 15 to get 17. The simplified expression is a + 17.
If you had a value for a, you could substitute it and then calculate to get the total future amount, which refers to the result after the value of a has been included. For example, if you find out that a equals 3, then the expression 2 + 3 + 15 would result in 20.