Answer:
the answer is B
Step-by-step explanation:
area of the minor arc is teter all over 360 times 2 pie r square. 
that is 

= but because the question said for length AB, youvhave to use only one radius.

You the use 40 to cancel 160 and 360 to get 4 all over 9 times 2 pie times 9.

You then cancel 9 with 9 to get 4 times 2 times pie 

this is equal to 

 
        
             
        
        
        
Answer:
The rate at which both of them are moving apart is 4.9761 ft/sec.
Step-by-step explanation:
Given:
Rate at which the woman is walking, = 3 ft/sec
 = 3 ft/sec
Rate at which the man is walking, = 2 ft/sec
 = 2 ft/sec
Collective rate of both,  = 5 ft/sec
 = 5 ft/sec
Woman starts walking after 5 mins so we have to consider total time traveled by man as (5+15) min  = 20 min
Now,
Distance traveled by man and woman are  and
 and  ft respectively.
 ft respectively.
⇒ 
⇒ 
As we see in the diagram (attachment) that it forms a right angled triangle and we have to calculate  .
 .
Lets calculate h.
Applying Pythagoras formula.
⇒  
  
⇒ 
Now differentiating the Pythagoras formula we can calculate the rate at which both of them are moving apart.
Differentiating with respect to time.
⇒ 
⇒ 
⇒  ...as
                         ...as 
⇒ Plugging the values. 
⇒  ...as
                       ...as  ft/sec
 ft/sec
⇒  ft/sec
  ft/sec
So the rate from which man and woman moving apart is 4.9761 ft/sec.
 
        
             
        
        
        
The slope is 2/3 you’re welcome :)
        
             
        
        
        
You know a1. 
So find a2, a3, and so on until a7. 
a(1) = 12
a(2) = 16
a(3) = 20
a(4) = 24
a(5) = 28
a(6) = 32
a(7) = 36
Each is 4 more than the previous.