Final answer:
The expression at position 1 is equivalent to option C) x + 30.
Step-by-step explanation:
The expression at position 1 is equivalent to option C) x + 30.
To determine this, we look at the given options and identify the expression that represents the item at position 1. In this case, position 1 refers to the first item in the list. Therefore, we choose the expression C) x + 30, which is the first option.