Answer: B. 140 cubic inches.
Step-by-step explanation:
The question is asking you to find the volume of the rectangular prism. 
You can find this by using this formula:

Where w is the width, h is the height, and l is the length. 
Substitute the sides of the rectangular prism into the equation:

The volume of the prism is 140 cubic inches.
The correct answer is B.
 
        
             
        
        
        
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➷ a) (1)^2 + 20 = 21
(2)^2 + 20 = 24
(3)^2 + 20 = 29
b) (5)^2 + 20 = 45
(6)^2 + 20 = 56
There are 5 terms less than 50
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