B.yuri divided by n instead of n-1
        
                    
             
        
        
        
Answer: 4(3-t)(3+t)
Step-by-step explanation:
after you find the GCF you will have 4(9-t) squared. since 9 is square you will after to put the square root of 9 (which is 3) into the equation when you factor it further. therefore giving you 4(3-t)(3+t). if you un- factored your equation you would get 4(81-t) because 9x9 is 81 not 3. hope this helps. just learned this too lol
 
        
             
        
        
        
Answer:
b/a
Step-by-step explanation:
Given,(b^-2)/a*(b^-3)
or,(b^-2+3)/a
or,b/a
 
        
                    
             
        
        
        
Answer: The 8 pound bag
Step-by-step explanation: you divide 9.45 by 5 and you get the unit rate of 1.89 and then you divide 13.68 by 8 and you get the unit rate of 1.71 which means the 8 pound bag is cheaper.
 
        
             
        
        
        
Answer:
Tasha made her mistake in step 4.