Answer:
 = 1+2n and 63
= 1+2n and 63
Step-by-step explanation:
the question belongs to arithmetic sequence and  can be determined by the formula
 can be determined by the formula
  = a1 + d (n-1)
= a1 + d (n-1)
Let "  " represents the number of band members in the nth row
 " represents the number of band members in the nth row
and 'd' represents the common difference.( as stated each row  has 2 more band members than the row before it)
therefore, d=2
'a1' represents first row that has three members. So, a1 = 3
->Rule for nth term will be:
  = 3 + 2(n-1)
= 3 + 2(n-1)
  = 3 + 2n -2
= 3 + 2n -2
  = 1+2n
= 1+2n
-> In order to find total number of band members ' '
'
Let  represent total number in n rows
 represent total number in n rows
We'll use the formula, i.e   = n/1 (
 = n/1 ( +
 +   )
)
where, n is the number of terms,  is the first term and
 is the first term and  is the last term
 is the last term
So,
n=7
 = 1 + 2(7)= 15
 = 1 + 2(7)= 15
=> = 7/2 (3 + 15)
 = 7/2 (3 + 15)
 = 63
 = 63
The total number of band members are 63
 
        
             
        
        
        
Answer:
50+90+3x+1=180..................... 
 
        
                    
             
        
        
        
The answer is b hope it helps
        
                    
             
        
        
        
The graph is misleading because it appears to be showing a huge increase, however, it is showing this increase over a huge time span of 13 years, which is actually quite a small amount for only a few hundred customer increase.