Rewrite the following expression by replacing all roots with appropriate exponents. Do not evaluate or simplify the expression. \[ 4+\sqrt[3]{(3 y)^{7}} \]

The cube root of any number can be expressed as raising that number to the power of 1/3. Thus, the expression   4 + ∛[(3y)⁷] can be rewritten as   4 + ((3y)⁷)^(1/3) or 4 + (3y)^(7/3). Both forms are equivalent and correctly replace the cube root with an exponent.