Subsequent means following (in time, order or place f.e.)
        
             
        
        
        
Answer:
24x+48  using the <u>distributive property.</u>
Step-by-step explanation:
 
        
                    
             
        
        
        
The answer would be about 93 km in length.
 
        
             
        
        
        
The speed of one car is 'S'.  The speed of the other car is (S + 10).
In 5 hours, the first car travels (5S) miles, and the other car travels  5(S + 10) miles.
Since they're going in opposite directions, the distance between them at any time
is the sum of the distance that each one has traveled.
500 = (5S) + 5(S + 10)
500 = 5S  +  5S + 50
500 = 10S + 50
Subtract 50 from each side:
450 = 10S
Divide each side by 10
S = <u>45</u>
S + 10 = <u>55</u>
        
             
        
        
        
1 + sec^2(x)sin^2(x) = sec^2(x)
This becomes
1+tan^2(x) = sec^2(x) which is an identity
You could 
1 + sin^2(x)/cos^2(x) = sec^2(x)
then
cos^2(x) + sin^2(x) = cos^2(x)sec^2(x)
1 = 1