Answer
12855.04 ft³
Step-by-step explanation:
regular Octagon consists of 8 congruent triangles
B = (13.28 x 11) / 2 x 8=584.32
V = BH = 584.32 x 22 = 12855.04
 
        
                    
             
        
        
        
The answer is:  " x = 11 ¼ "  ; or write as:  " x = 11.25 " .
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Explanation:
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  (40*9) ÷ (4*8) = x  ;  Solve for "x" ;
(40 * 9 = 360) . 
(4 * 8 = 32) .
(360) ÷ (32) = 45/4 = 11 ¼  ; or write as:  11.25 .
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Answer:
$16.35
Step-by-step explanation:
15 x 1.09 = 16.35