Final answer:
By calculating the volume of water (9/10 of 3744 cubic inches) and multiplying it by the weight per cubic inch (0.036 pounds), the closest estimate to the total weight of the water in the aquarium is 120 pounds.
Step-by-step explanation:
The student's question pertains to finding the approximate weight of the water in an aquarium. Given that the aquarium can hold 3744 cubic inches of water and it is filled to 9/10 of its capacity, we first calculate the volume of water by multiplying 3744 by 9/10, resulting in 3369.6 cubic inches. Next, given that water weighs about 0.036 pound per cubic inch, we multiply the volume of water by the weight per cubic inch to find the total weight: 3369.6 cubic inches × 0.036 pounds/cubic inch = 121.3056 pounds. The closest estimate to 121.3056 pounds is 120 pounds, which is option B.