how can you read the expression 6³?

Brief Explanations:

In mathematics, when we have an expression (a^{n}), where (a) is the base and (n) is the exponent. For (6^{3}), the base is (6) and the exponent is (3). The general rule for reading (a^{n}) is "a to the nth power". So for (6^{3}), we substitute (a = 6) and (n=3).

Answer:

Six to the third power.