which number is a perfect cube?\n9\n18\n27\n36

Answer:

C. 27

Explanation:

Step1: Recall perfect - cube definition

A perfect cube is a number that can be written as the cube of an integer.

Step2: Check each option

For 9, $\sqrt[3]{9}\approx2.08$, not an integer. For 18, $\sqrt[3]{18}\approx2.62$, not an integer. For 27, $\sqrt[3]{27} = 3$ since $3\times3\times3=27$, 3 is an integer. For 36, $\sqrt[3]{36}\approx3.30$, not an integer.