Answer:
The answer is "7.122 billion"
Step-by-step explanation:
Please find the complete question in the attached file. 
Using formula:
 
  
 
So,  
 
when it becomes  so plug the value into the formula
 so plug the value into the formula  

 
        
             
        
        
        
36 and 48
a = b+12
a+b = 84
(b+12) + b =84
2b +12 = 84
2b = 72
b= 36
a = b + 12
a = 36 + 12
a = 48
        
             
        
        
        
Answer:
First picture: -4,913
Second picture: 20.25
Step-by-step explanation:
-17^5/-17^2 = -17^3 
-17 × -17 × -17 = -4913
4.5^5/4.5^3 = 4.5^2
4.5 × 4.5 = 20.25 
Do you see how I had the same whole number on the top and bottom? (17 was on top and 17 was on bottom)
The exponents were those tiny numbers you saw. 
Whenever you are dividing by the same whole number (-17/-17), you can subtract exponents. 
When you multiply the same whole number, you can add the exponents. 
Hope this helps! Best of luck :)
 
        
             
        
        
        
Answer:
a) The probability that at least 5 ties are too tight is P=0.0432.
b) The probability that at most 12 ties are too tight is P=1.
Step-by-step explanation:
In this problem, we could represent the proabilities of this events with the Binomial distirbution, with parameter p=0.1 and sample size n=20.
a) We can express the probability that at least 5 ties are too tight as:

The probability that at least 5 ties are too tight is P=0.0432.
a) We can express the probability that at most 12 ties are too tight as:

The probability that at most 12 ties are too tight is P=1.