Answer:
Step-by-step explanation:
Combine like terms
3v + 4v
26=7v+12
Subtract    12  from both sides of the equation
26-12
12-12
14=7v
Simplify
so subtract the 12's
Divide both sides of the equation by the same term
14 divided by 7
7 divided by 7
Simplify
do the division and move the term on the other side and it would be
v=2
Solution
  
v=2
 
        
                    
             
        
        
        
1 400 000 000 000 000 000 000 km =  1.4 * 10^21 km
 
        
             
        
        
        
Answer:
(g-f) (-1)= sqrt(15)
(f/g)(-1)= 0
(g+f)(2)=sqrt(3)-3
(g*f)(2)=-3*sqrt(3)
Step-by-step explanation:
We have to eval the expressions given in the point indicated.
Lets start by the first equation
(g-f)(-1)= g(-1) - f(-1)=  =
 = 
Now, lest continue with the others
(f/g)(-1)= f(-1)/g(-1)= (1-1)/sqrt(15)=0
(g+f)(2)=g(2)+f(2)=sqrt(3)-3
(g*f)(2)=g(2)*f(2)=sqrt(3)*(-3)=-3sqrt(3)
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
The sum you are trying to understand is this. 

Remember that in general when you have a geometric series  
  you have that
 you have that 
 and that equality is true as long as
      and that equality is true as long as      .
. 
Therefore here we have 
 and
        and   
Therefore we can use the formula and 

 
        
             
        
        
        
Its B, cause it’s collinear