To find the volume of a rectangular prism, you can use the formula:
\[ \text{Volume} = \text{length} \times \text{width} \times \text{height} \]
For the given dimensions of the rectangular prism:
- Length = 2.5 feet
- Width = 3.5 feet
- Height = 4 feet
Now, plug in the values:
\[ \text{Volume} = 2.5 , \text{ft} \times 3.5 , \text{ft} \times 4 , \text{ft} \]
First, calculate \( 2.5 \times 3.5 \):
\[ 2.5 \times 3.5 = 8.75 \]
Now, multiply that result by 4:
\[ 8.75 \times 4 = 35 \]
Therefore, the volume of the rectangular prism is
\[ \text{Volume} = 35 , \text{ft}^3 \]
So, the final answer is:
\[ \boxed{35 , \text{ft}^3} \]