For this case we have a function of the form:
 
 Where,
 A: initial amount
 b: decrease rate
 x: time in days
 Substituting values we have: 

 Therefore, the graph of the function is a decreasing exponential function in the first quadrant and that has an initial value of 40. 
Answer:
 graph of exponential function going from left to right in quadrant 1 through the point 0, 40 and approaching the x axis
 
        
        
        
Answer:
3776857867458675894678476845768478614
Step-by-step explanation:
40+3776857867458675894678476845768478574=
3776857867458675894678476845768478614
 
        
             
        
        
        
Answer:
BD = 8.8
Step-by-step explanation:
You have a right triangle.
The hypotenuse is BD
The side opposite the 27o angle is 4
Sin(27) = opposite / hypotenuse.
Sin(27) = 0.45399
opposite = 4
hypotenuse = ?
0.45399 = 4/hypotenuse
BD =  4/0.45399
BD = 8.811
The answer is 8.8
 
        
                    
             
        
        
        
Answer:
I believe it's the last one.