5% = 0.5
0.5n = 85
Divide by 0.5
0.5n = 85
/0.5      /0.5 
n = 170.
The number is 170.
        
             
        
        
        
We are given function: y= 
Where, x is the number of hours after 5a.m.
We need to approximates the number of people standing in line to catch a commuter train at 7 a.m.
From 5 a.m. to 7 a.m. total number of hours = 7-5 = 2 hours.
So, we need to plug x=2 in the given function.
Plugging x=2 in  , we get
, we get 

Let us simplify it now.
2^2= 4.
Therefore, 

= -20.524 + 63.642 - 3.333.
= 39.785 or 40 approximately.
Therefore, the number of people in line at 7 a.m. is approximately 40 people.
Option D.40 is correct option.
 
        
             
        
        
        
Answer:
y=24
Step-by-step explanation:
 
        
             
        
        
        
Answer:
constant
Step-by-step explanation:
 
        
             
        
        
        
Answer:
x=24
Step-by-step explanation:
Here, you need to make proportion and find x.
12:16=18:x
We multiply 12 by x and 16 by 18:
12x=288
Divide by 12 both sides : 
x=24