Given:
A man walks for x hours at a speed of  (x + 1) km/h and cycles for (x - 1) hours at  a speed of (2x + 5) km/h.
Total distance  travelled is 90 km.
To find:
The value of x.
Solution:
We know that,


A man walks for x hours at a speed of  (x + 1) km/h, so walking distance is
 km
 km
The man cycles for (x - 1) hours at  a speed of (2x + 5) km/h, so the cycling distance is 
 km
 km
Now,
Total distance = 90 km









Time cannot be negative. So, the only possible value of x is 5.
 
        
             
        
        
        
Answer:
And then  
  
C. 240
Step-by-step explanation:
Previous concepts
Analysis of variance (ANOVA) "is used to analyze the differences among group means in a sample".  
The sum of squares "is the sum of the square of variation, where variation is defined as the spread between each individual value and the grand mean"  
When we conduct a multiple regression we want to know about the relationship between several independent or predictor variables and a dependent or criterion variable.
If we assume that we have  independent variables and we have
 independent variables and we have   individuals, we can define the following formulas of variation:
 individuals, we can define the following formulas of variation:  
 
  
 
  
 
  
And we have this property  

If we solve for SSR we got:
 (1)
    (1) 
And we know that the determination coefficient is given by:

We know the value os  and we can replace SSR in terms of SSY with the equation (1)
 and we can replace SSR in terms of SSY with the equation (1)  

And solving SSY we got:


And then  
  
C. 240
 
        
             
        
        
        
-3x + 9 - 4 = x + 3 + 2x
-3x + 9 - 4 = 3x + 3
9 - 4 = 6x + 3
5 = 6x + 3
2 = 6x
1/3 = x
        
                    
             
        
        
        
Answer:50/500×100=10%
Therefore, 10% of 500 is 50.
Hope this answer helps you...
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
what is the blank for 
Step-by-step explanation:
sorry I mean bank