Final answer:
The volume of Jake's pool is 4.05 meters cubed.
Step-by-step explanation:
To find the volume of the pool, we need to multiply its length, width, and height. The formula for volume is V = lwh, where V is the volume, l is the length, w is the width, and h is the height. In this case, the length is 2.5 meters, the width is 1.8 meters, and the height is 0.9 meters. Plugging these values into the formula, we get V = 2.5 * 1.8 * 0.9 = 4.05 meters cubed.