Answer:
P(X = 3) = 0.14680064
Step-by-step explanation:
Formula=============================

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Given :
n = 8
p = 0.2
1 - p = 1 - 0.2 = 0.8
k = 3
Then

                
 
        
             
        
        
        
Given:
John had to pay a combined electric and gas bill $150. 
The electric portion of the bill was $90.
To find:
The ratio of money spent on electric to that on gas.
Solution:
Let x be the amount of gas bill.
The electric portion of the bill was $90 and John had to pay a combined electric and gas bill $150.  So,



The gas portion of the bill was $60.
The ratio of money spent on electric to that on gas is:




Therefore, the ratio of money spent on electric to that on gas is 3:2. 
 
        
             
        
        
        
The given expression is: 

So, there are two terms in the expression
1) 

2) -5
The constant term is -5. 
The co-efficient of 

 is 4.
 
        
        
        
A solution to a division problem means it is the quotient. And it tells us the solution to the dividend and divisor.