Answer:
a: about 800? nonfiction books in valley
b: valley and central has more fiction than nonfiction books
c: there's probably about 2600 books in hillside
Step-by-step explanation:
 
        
             
        
        
        
The given in the problem above is an arithmetic sequence with the first term equal to 4 and the common difference is 5. To determine the number of seats on row 23, use the formula,                                          an = a1 + (n - 1) d
Solving for the 23rd term,                                            an  = 4 + (22) 5 = 114 seats
Therefore, the answer is there are 114 seats on the 23rd row. 
 Welcome Bby (;
        
             
        
        
        
Answer:
Step-by-step explanation:
interchange x and y
y= 1/(x - 2)
x = 1 / (y - 2)      Multiply both sides by y - 2
x(y - 2) = 1          Remove the brackets
xy - 2x = 1          Add x to both sides
xy = 1 + 2x         Divide by x
y = (1 + 2x)/x
The brackets have been destroyed. The answer is as I've given it.
y = (1/x) + 2
 
        
             
        
        
        
The volume of the pyramid is 448m^3
(16)(12)(7)/3
= 1334/3
= 448