Final answer:
The expression that is equivalent to √7x is C 7x².
Step-by-step explanation:
The expression that is equivalent to √7x is C 7x². When we simplify the square root of a product, we can separate the factors and simplify each square root individually. In this case, we separate √7x as √7 * √x. The square root of 7 * 7 is 7, so the simplified expression is 7 * √x, which is equivalent to 7x.
Learn more about Expression simplification