V=

note, r and R are differnt
so multipl both sides by (r+R)
V(r+R)=12R
distribute
Vr+VR=12R
minus VR from both sides
Vr=12R-VR
undistribute R
Vr=R(12-V)
divide both sides by (12-V)

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Answer:
probably 6 or 11 not too sure but that's my answer 
 
        
             
        
        
        
For part one, this means that the y value (the second value) is -8, and since we know that y=3x-2, we can say that -8=3x-2.
Adding 2 to both sides using the addition property of equality, we get -6=3x. Next, dividing by 3 using the division property of equality, we get -2=x. Therefore, plugging -2 in the point, we get (-2,-8) as our point. 
For the second point, we have 2 as the x value, so we can plug that into 3x-2 to get 3*(2)-2=6-2=4 as the y value, making the point (2,4)
Feel free to ask further questions!
        
             
        
        
        
Answer:
t=sqrt(41)/4
Step-by-step explanation:
h=-16t^2+41, h=0. -16t^2+41=0, t=sqrt(41)/4
 
        
             
        
        
        
Answer:
2
Step-by-step explanation:
If 8cm divided by 4cm = 2cm