The answer is:  z² .
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Given: <span>(x÷(y÷z))÷((x÷y)÷z) ;  without any specified values for the variables; 
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we shall simplify.
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We have: 
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</span>(x÷(y÷z))  /  ((x÷y)÷z) .
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Start with the first term; or,  "numerator":  (x÷(y÷z)) ;
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x  ÷ (y / z) = (x / 1) * (z / y) = (x * z) / (1 *y) =  [(xz) / y ] 
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Then, take the second term; or "denominator":
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((x ÷ y) ÷z ) = (x / y) / z =  (x / y) * (1 / z) = (x *1) / (y *z) = [x / (zy)]
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So (x÷(y÷z))  /  ((x÷y)÷z)  = (x÷(y÷z)) ÷  ((x÷y)÷z) =
 [(xz) / y ] ÷ [x / (zy)]  = [(xz) / y ] /  [x / (zy)] =
                                                                    [(xz) / y ] * [(zy) / x] ;
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                               The 2 (two) z's "cancel out" to "1" ; and
                                  The 2 (two) y's = "cancel out" to "1" ; 
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And we are left with: z * z = z² .  The answer is:  z² .
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The answer is b 
hope this helps :)
        
                    
             
        
        
        
So 
<span>20% of 18.50 = ____ </span>
<span>to get this you multiply </span>
<span>20% is .20 in decimal form </span>
<span>18.50 x .20 = $3.70 </span>
<span>so 20% is $3.70, which means the discount is $3.70 </span>
<span>so then you subtract $3.70 from the original price of 18.50 and you get </span>
<span>$14.80 which is your answer (:</span>