Final answer:
To evaluate the expression 2b where b equals 9, you substitute 9 in place of b, resulting in 2 times 9, which is 18.
Step-by-step explanation:
To evaluate the expression 2b when b = 9, simply substitute the value of b into the expression. Thus, we have:
2b = 2 * 9 = 18
The evaluated expression results in 18, which means that when b is equal to 9, 2b equals 18.