Answer:

Step-by-step explanation:
 
        
             
        
        
        
 Answer:
3+12=15
Step-by-step explanation:
15-12= 3
3+12=15
 
        
             
        
        
        
Answer:
67
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
14 = 1000 
.014 = 
ln(.014) = k ln(e)
k = -4.268 
~~~~~~~~~~~~~~~~~~
after 3 hrs
1000 
0.00274
~~~~~~~~~~~~~~~
4 = 1000 
.004 =  
ln(.004)/-4.268 = t
t = 1.29368 hrs
 
        
             
        
        
        
7 1/2 * 2 = 15
The 3rd hour was 1/4 of the total distance in 3 hours. 
1/4 = 0.25 as a decimal, and 25% as a percent. 
15 (0.25) = 3.75
15 + 3.75 = 18.75
0.75 = 3/4 as a fraction.
So, he cycled 18 3/4 miles in 3 hours. 
I hope this helps, and I am sorry if I get this question wrong. (which is in all likelihood)