Answer: 
O 81 km per hour
Explanation
Given parameters: 
Number of days traveled  = 3 days
Distance covered on the first day  = 1080km
Time of travel  = 10hrs
Rate of travel  = 108km/hr
Time of travel on second day = 12hrs
Rate of travel  = 90km/hr 
Time of travel on third day  = 18hrs
Rate of travel  = 60km/hr 
Unknown
Average speed  = ? 
To find the average speed, we sum the distances and divide by the sum of the time. 
   Average speed  = 
 we do not know the second and third distances;
   Distance  = speed x time
D2  = 90 x 12 = 1080km
D3  = 60 x 18  = 1080km 
     Now; 
   Average speed  = 
   
  Average speed  =  = 81km/hr
   = 81km/hr
The average speed is 81km/hr
 
        
             
        
        
        
Answer:

Step-by-step explanation:
We want to evaluate the equation

at y=-2
We just have to substitute to obtain;

We now multiply to get:

This is the same as:

We multiply the numerators separately and denominators separately to get:


This implies that

 
        
             
        
        
        
Answer:
(
−
5
)
(
−
4
) 
Step-by-step explanation:
Not 100 percent sure
 
        
             
        
        
        
Answer:
4 + 14b
Step-by-step explanation:
First, you need to distribute so, 
2*2= 4   and
2*7b= 14b 
 
        
             
        
        
        
Answer:
I think it's right answer is 530