Answer:
t =12 m
Step-by-step explanation:
We can use similar triangles and proportions to solve this problem.
Put the smaller triangle on top and the larger triangle on bottom
12         9
------ = -------
16          t
Solve by using cross products
12 t = 9*16
12 t =144
Divide by 12
12t/12 = 144/12
t = 12
 
        
                    
             
        
        
        
Answer:
X = -1
Step-by-step explanation:
because if X is greater than -2 then it is -1 because it is the closest to 0 that is why it is -1 > -2 even though you may think that -2 is greater than -1  it's not 
 
        
                    
             
        
        
        
Answer:
a.) 4 half lives have passed
b) 9.388 minutes
Step-by-step explanation:
Formula for exponential growth / decay is given as:

Where  is the final population
 is the final population
 is the initial population
 is the initial population
 is the growth factor
 is the growth factor
 is the time taken for the growth 'b'
 is the time taken for the growth 'b'
 is the amount of time
 is the amount of time
Here, we are given that:
 = 6. 9 grams
 = 6. 9 grams
 = 110.4 grams
 = 110.4 grams

 min
 min
To find:
a.) Number of half lives taken for the decay.
b.) Total time in the decay.
Solution:
a.) Number of half lives taken for the decay is nothing but equal to  .
.
Putting the values in the formula, we get:

Therefore, the answer is:
<em>4 half lives </em>have passed.
b.) Total time of decay. We have to find the value of  here.
 here.
From answer of part a.):

 
        
             
        
        
        
7-3=4 
4/2=2
The answer is 2
        
                    
             
        
        
        
Answer:
12.57
Step-by-step explanation: