Answer: B. 53
Step-by-step explanation:
 
        
             
        
        
        
Answer:
2,3,6
Step-by-step explanation:
those are the only positive factors in there
 
        
             
        
        
        
Answer:
5 seconds
Step-by-step explanation:
In order to find the time when it landed, we will have to find the x-intercepts. 
Equation given to us : -16t² + 48t + 160 
Let's take the GCD, which is -16. 
-16( t² - 3t - 10 )
Factoring what's inside the brackets, we get the x-intercepts. 
What multiples to -10 but adds up to -3? The numbers are -5 and 2
-16 ( t - 5 ) ( t - 2 )
X-intercepts are t - 5 and t - 2 
Which is 5 and 2 seconds. But one of this is an extraneous solution and that is 2. 
If we substitute the value of 2 in the equation, we will not get 0. 
During the x-intercept, the x has a value and y is 0. If we substitute 5 ans x. we will get y as 0. 
Hence, the answer is 5 seconds.