Answer:
To represent Sheila's age next year, we need to consider her sister's current age. Let's denote Sheila's sister's current age as "x".
According to the given information, next year Sheila's age will be twice her sister's current age. Therefore, Sheila's age next year can be represented by the expression 2x.
The action to take in this case is to write the expression 2x, which represents Sheila's age next year based on her sister's current age.
Explanation: