Answer:
Step-by-step explanation:
b, i'm not sure but thats what i think. 
 
        
             
        
        
        
Answer:
a=3 and b=-2
Step-by-step explanation:
We are given that five  terms of a quadratic sequence are
1 8, 21, 40, 65.
The nth term of this sequence 
=
We have to find the value of a and b where a and b are integers.
For n=1
 ......(1)
   ......(1)
For n=2

 
 
 .....(2)
   .....(2)
Subtract equation (1) from (2) we get


Using the value of a=3 in equation (1)


Hence, the value of 
a=3 and b=-2
 
        
             
        
        
        
Answer:
will
Step-by-step explanation:
have
 
        
             
        
        
        
Answer:
23 chalkboards
Step-by-step explanation:
Given:
Mean length = 5 m
Standard deviation = 0.01
Number of units ordered = 1000
Now, 
The z factor =  
or
The z factor =  
or
Z = - 2 
Now, the Probability P( length < 4.98 )
Also, From z table the p-value = 0.0228
therefore,
P( length < 4.98 ) = 0.0228
Hence, out of 1000 chalkboard ordered (0.0228 × 1000) = 23 chalkboard are likely to have lengths of under 4.98 m.
 
        
             
        
        
        
You would round it up to 9,400 because the 8 is next to the 3 and 8>5