Which of the following is an equivalent expression to 7/(-5.5)^0 + 4x9 when applying the zero power rule?

The zero power rule states that any non-zero number raised to the power of 0 is equal to 1. Using this rule, the expression 7/(-5.5)^0 becomes 7/(1), which simplifies to 7.

Therefore, the equivalent expression to 7/(-5.5)^0 + 4x9 when applying the zero power rule is 7 + 4x9.