Answer:
2/3 hours
Step-by-step explanation:
40 minutes = 40/60 = 2/3 hours 
 
        
             
        
        
        
Answer:
(a) -7 , - 9 , - 11
(b) Arithmetic sequence
(c) There is a common difference of -2
(d) -53
Step-by-step explanation:
(a) To find the next three terms , we must firs check if it is arithmetic sequence or a geometric sequence . For it to be an arithmetic sequence , there must be a common difference :
check :
-3 - (-1) = -5 - (-3) = -7 - (-5)  = -2 
This means that there is a common difference of -2 , which means it is an arithmetic sequence.
The next 3 terms we are to find are: 5th term , 6th term and 7th term.
 = a + 4d
 = a + 4d
 = - 1 + 4 ( -2 )
 = - 1 + 4 ( -2 )
 = -1 - 8
 = -1 - 8
 = - 9
 = - 9
6th term = a +5d
 = -1 + 5(-2)
 = -1 + 5(-2)
 = -1 - 10
 = -1 - 10
 = - 11
 = - 11
 = a + 6d
 = a + 6d
 = -1 + 6 (-2)
 = -1 + 6 (-2)
 = -1 - 12
 = -1 - 12
 = -13
 = -13
Therefore : the next 3 terms are : -9 , -11 , - 13
(b) it is an arithmetic sequence because there is a common difference which is -2
(c) Because of the existence of common difference
(d)  = a + 26d
 = a + 26d
 = -1 + 26 ( -2 )
 = -1 + 26 ( -2 )
 = -1 - 52
 = -1 - 52
 = - 53
 = - 53
 
        
             
        
        
        
27 is how much kids did the survey because I added all the fractions together like how the question did 3/5 which is 3 × 5 = 15
        
             
        
        
        
Wait it says ur in high school so u can't be over 30. that isn't possible. So what's the problem here? not good at math.