Answer:
The 12 children selected in Mrs. Smith's kindergarten class.
Step-by-step explanation:
A sample is a representative part of a population on which a research is carried out.
The study In Mrs Smith's class was to find out the number of hours the children in Kindergarten Sleep in a day. Out of the total number of students, 12 were selected for observation. The 12 childen selected is therefore  a sample of the class.
 
        
             
        
        
        
Answer:
hi I dont now is this will help you but use M A T H W A Y it will give you the step b step info and the answere 
Hope it help
Step-by-step explanation:
 
        
             
        
        
        
Answer:
2×π×(1/2)L×L+2×π×((1/2)L)^2
Step-by-step explanation:
perimeter of cross-section × height +2× area of cross-section
 
        
             
        
        
        
Step-by-step explanation:
I count four 6s, four 4s and three b.
so, we have
6⁴×4⁴×b³ or (using the same symbols as above) 
6⁴.4⁴.b³