Answer: 2
Step-by-step explanation:
3/5 of 30 = 18(AL)
2/6 of 30 = 10 (ML)
18+10 = 28 (AL+ ML)
the remainder 
30-28 = 2 (CL)
 
        
             
        
        
        
Answer:
B. 90 degrees
Step-by-step explanation:
The definition of supplementary is that they add up to 180 degrees.  If the measure of angle A is 90 degrees, then angle B is 180-90 = 90 degrees.
 
        
             
        
        
        
Step-by-step explanation:
km to m
1 km = 1000 m
2km = 2000 m
2000 : 800
20:80
answer: 1:4
 
        
             
        
        
        
Lines of symmetry if the triangle is isosceles. 
4, 2, 1
        
             
        
        
        
Answer:
13 buttons
Step-by-step explanation:
The first step is to add the buttons received by the 6 students.
= 10 + 14 + 15 + 12 + 13 + 14
= 78 buttons 
Therefore the number of buttons received by each students can be calculated as follows
= 78/6
= 13 buttons
Hence each student will receive 13 buttons