The surface area formula for any sphere is 4(pi)(radius)^2
The radius is half of the diameter.
18.6 / 2 = 9.3
So, plug into the formula and solve.
4(3.14)(9.3)^2 = 1086.3 mm^2
 
        
             
        
        
        
Answer:
y=31
Step-by-step explanation:
 we know that x=4 
5+6(4) = y 
5+24 = 31 
y= 31
Hoped this helped
 
        
                    
             
        
        
        
Answer:
3(z+3) = 3z + 9 if thats what your asking
Step-by-step explanation:
 
        
             
        
        
        
Answer:
 A and B are correct
Step-by-step explanation:
if x:y is 1:3 then x is 1 and y is 3
1/3 of 3 is 1 so A is correct 
3/4(1+3) is 3 so B is correct
But
1/4 × 3 is not 1 so C is not correct
3/4 ×1 is not 3 so D isn't correct
 
        
             
        
        
        
Answer:
Hoping someone else can answer with more confidence, but here's what I have: 
on the left hand side:
upper is partial/penumbral lunar eclipse
lower is total solar eclipse
on the right hand side:
on the top: it's impossible for the moon to be behind the sun, so I'm not sure what they want there
middle is total solar eclipse
bottom is partial/penumbral lunar eclipse
Hope I helped at least a little