Answer:
n = the first
n + 1 = the 2nd
n + 2 = the 3rd
 
n(n + 2) - (n + 1) = 10(n + 2) + 1
n2 + 2n - n - 1 = 10n + 20 + 1
n2 - 9n - 22 = 0
(n - 11)(n + 2) = 0
 
If two factors = 0, at least one must = 0.
 
n - 11 = 0
n = 11
 
11,12,13
 
n + 2 = 0
n = -2
 
-2,-1,0
 
        
             
        
        
        
Simplify means solve and to solve we first need to do 2 to the 2nd power which is two *  2 that equal 4 than do 2 to the 10th power that equal 1024 and than we can just do
4 divided by 1024 = 0.0390625 
        
             
        
        
        
First you have to get rid of the mixed numbers, so multiply the whole numbers with the denominators and add the numerators so that way you get: 
14/3 times 45/4....then cross simplify if possible and finally you can multiply the numerators and the denominators...
7/1 times 15/2 = 105/2....simplify it and get: 52 1/2
 
        
             
        
        
        
Total number of computers sold last week from Best Bargain = 340
Percentage of laptops sold last week from Best Bargain = 75%
These are the information's that we can find given in the question. Based on these information's the answer to the question can be easily found. 
Number of laptops sold from Best Bargain last week = 340 * (75/100)
                                                                                     = 340 * (3/4)
                                                                                      = 85 * 3
                                                                                       = 255
So out of the total of 340 computers sold from Best Bargain last week, 255 were laptops. I hope this is the answer you were looking for.
        
             
        
        
        
386 is the answer.................................