Of means multiply 
3/5 *n=30
3/5 5/3 cancels than you do 30 *5/3 =50 
The answer is 50 you can check your answer by doing 3/5 *50=150/5 or 30 so it's correct .
        
                    
             
        
        
        
Answer:

OK, lets start by drawing a basic graph (the first one) so we can visualize.
We already know that the y coordinate of the circle's center is  .
. 
We know that the circle is tangent to the  axis at
 axis at 
That means the x coordinate of the center has to be  , as the tangent is a point on the edge of the circle that touches a line at exactly one point.
, as the tangent is a point on the edge of the circle that touches a line at exactly one point.
The radius is the distance from the center of the circle to its edge. We know the center's location now, it is  and a point on the edge of the circle (the tangent point) which is
 and a point on the edge of the circle (the tangent point) which is  . so the distance between the points is 4 which is the radius (you can use the distance formula, but it's quite oblivious.)
. so the distance between the points is 4 which is the radius (you can use the distance formula, but it's quite oblivious.) 
We can imagine the circle should look like this (the second one):
Now we can piece together an equation
The equation of a circle is  where
 where  is the center and
 is the center and  is the radius. When we put the numbers in: we get
 is the radius. When we put the numbers in: we get  which can be simplified into
 which can be simplified into  which is the answer.
 which is the answer.
Step-by-step explanation:
 
        
             
        
        
        
Answer: z = 7
Step-by-step explanation:
Step 1: Subtract 4 from both sides
z + 4 - 4 = 11 -4
z = 7
 
        
                    
             
        
        
        
V= pi * r^2 * h
471 = 3.14 * r^2 *6
471 = 18.84 * r^2
25 = r^2
Sqrt25 = r
5 = r
D= 2*5
D= 10in