Alright here goes, it’s 7.05024•10^11
Explination:
Maths…
Hope this helps!
 
        
                    
             
        
        
        
Let x be the length of the train.
On the basis of the observer;
Speed of the train = x/6
On the basis of the bridge;
Total distance covered by any point of the train= 350+x
Speed = (350+x)/20
Equating the two expressions of speed;
x/6 = (350+x)/20
20(x) = 6(350+x)
20x = 2100+6x
(20-6)x = 2100
14x = 2100
x= 2100/14 = 150 m
Speed = x/6 = (350+x)/20 = 150/6 = 500/20 = 25 m/s.
Therefore,
Length of train = 150 m
Speed of train = 25 m/s
        
             
        
        
        
Step-by-step explanation:
option C is the correct answer of this question 
 
        
             
        
        
        
First, 
149,500 * .10 = 14,950
149,500 - 14,950 = 134,550
then,
134,550 * .05 = 6727.50
134,550 - 6727 = 127,822.55 
127,822.50 * .04 = 5112.90
trade discount = 14950 + 6727.50 + 5112.90 
26790.40
hope this help
        
                    
             
        
        
        
17x + 16x + 12x =180
45x = 180
x = 4
Largest angle = 17*4 = 68 degrees