I think the answer is B but I’m not sure, sorry if i got it wrong, 
have a good day and have a good Christmas
        
             
        
        
        
<h3><u>
Answer:</u></h3>
<h3><u>
Step-by-step explanation:</u></h3>
<u>Given: </u>
<u>Let's simplify.</u>
- =>  
- =>  
- =>  
- =>  
- =>  
- =>  (Estimated) (Estimated)
<u>Therefore, r ≈ 2.82.</u>
Hoped this helped.
 
        
        
        
41 there are 12 numbers take middle
 
        
                    
             
        
        
        
Answer: (2r)⁸ or (2r)∧8
Step-by-step explanation:
Hi, to answer this question we have to analyze the information given:
Double r = this means that we have to multiply the variable "r" by 2 .(2r)
Then raise the result to the 8th power = this means that the product (2r) is the base and 8 is the exponent.
Mathematically speaking  
(2r)⁸ or (2r)∧8
Feel free to ask for more if needed or if you did not understand something.
 
        
                    
             
        
        
        
To solve the problem we must know about Z-Score.
<h3>What is Z-score?</h3>
A Z-score helps us to understand how far is the data from the mean. It is a measure of how many times the data is above or below the mean. It is given by the formula,

Where Z is the Z-score,
X is the data point,
μ is the mean and σ is the standard variable.
The life span of an appliance that has a z-score of –3 is 24 months.
Given to us
- Mean, μ = 48 months,
- standard deviation, σ = 8 months,
- Z-Score = -3
<h3> What is the life span of an appliance?</h3>
The life span of the appliance can be calculated using the Z-score formula,

Substitute the values,

Hence, the life span of an appliance that has a z-score of –3 is 24 months.
Learn more about Z-score:
brainly.com/question/13299273