Answer:
3, 4, 5 
Step-by-step explanation:
check the coordinates
 
        
             
        
        
        
Answer:
32767 distinct color grouping
Step-by-step explanation:
Given data:
Total tube is 13
for distinct color, group can be 1,2,3,4,.... 15
For total number of ways we have following relation

here n = 13 so we have

for at least one 


= 32767 distinct color grouping
 
        
             
        
        
        
Answer:
m = 0 or m = 2
Step-by-step explanation:
m² - 2m = 0
m ( m − 2 ) = 0
m = 0
m − 2 = 0
m = 2
 
        
                    
             
        
        
        
Answer:
6.4
Step-by-step explanation:
 
        
                    
             
        
        
        
X=area of Sahara.
y=area of the Gobi Desert.
We suggest this system equations:
x+y=4000000
x=7y
solve by susbstitution method.
(7y)+y=4,000,000
8y=4,000,000 
y=4,000,000 / 8=500,000
x=7y
x=7(500,000)=3,500,000
The area of Sahara=3,500,00 miles².
The area of the Gobi Desert=500,000 miles²
To check:
Te sum of their areas is : 3,500,000 miles²+500,000 miles²=4,000,000 miles²
Te area of sahara (3,500,000 miles²) is 7 times the area of the Gobi Desert (7*500,000 miles²=3,500,000 miles²).