$\"\"$

The volume of the prism is $\"\"$

From the diagram base of the rectangular prism is rectangle. So, use the area of the rectangle to find B.

Area of a rectangle is $\"\"$ . So, $\"\"$ .

$\"\"$ (Substitute 10 for l, 3 for b)

$\"\"$ (Multiply: $\"\"$ ) $\"\"$

$\"\"$ (Formula for volume of a prism)

$\"\"$ (Substitute 30 for B, 4 for h)

$\"\"$ (Multiply: $\"\"$ ) $\"\"$

The volume of the rectangular prism is $\"\"$ .