Final answer:
To find an equivalent expression for 18⁹ divided by 18⁴, you simply subtract the exponent in the denominator from the exponent in the numerator, resulting in 18⁵.
Step-by-step explanation:
To find an equivalent expression for 18⁹ divided by 18⁴, we can apply the properties of exponents. Specifically, when dividing two powers with the same base, we subtract the exponents. Therefore, we can express the original problem as 18⁹ ÷ 18⁴ = 18⁹−4, which simplifies to 18⁵. This is because you subtract the exponent of the denominator from the exponent of the numerator when the bases are the same. So the result is 18⁵.