we know that
For a spherical planet of radius r, the volume V and the surface area SA is equal to

The
 ratio of these two quantities may be written as

we know 


therefore
the answer is

 
        
                    
             
        
        
        
Answer:
A. 10+10+5x=80 or 20+5x=80
B. Disagree, After the pay for each person to get in the have 60 dollars left. Each ride costs 5 dollars. 60 divided by 5=12 and each of them would need a ticket, so they could only ride 6 rides/
C. 20/5=4=they could by an additional 4 tickets, each would need a ticket so they could ride 2 more rides each
Step-by-step explanation:
80-20=60
60/5=12
 
        
                    
             
        
        
        
Answer:
   90 inches
Step-by-step explanation:
The perimeter of the inscribed triangle is 1/2 that of the enclosing triangle. So, the total of perimeters is ...
   (3·16 in)(1 +1/2 +1/4 +1/8) = (48 in)(15/8) = 90 inches
 
        
             
        
        
        
If there are 7 bananas out of 14 pieces of fruit the probability of selecting a banana is 7/14. 7/14 can be reduced to 1/2. 7 divided by 7 is 1, and 14 divided by 7 is 2 making the answer 1/2!