Answer:
D
Step-by-step explanation:
You are going to roll two dice. 
If you roll one die, then there are 6 possible outcomes: 
If you roll two dice, then there are  possible outcomes:
 possible outcomes:

Here the first number is the number rolled on the first die, the second number is the number rolled on the second die.
 
        
                    
             
        
        
        
9514 1404 393
Answer:
   3.61 seconds
Step-by-step explanation:
The bird starts 50 feet in the air, so will come down to a height of 40 feet after 3.61 seconds.
We want to solve h = 40.
   40 = -16t^2 +55t +50
   16t^2 -55t -10 = 0
   t = (55 +√(55^2 -4(16)(-10)))/(2(16)) = (55 + √3665)/32 ≈ 3.61060
The bird will be 40 ft above the ground the first time after about 3.61 seconds.