Help #1 ​

1)   You can just add all of the numbers to get the total....use a calculator

 

     or use      sum =  n ( a1+an) / 2   =   7 (26+44)/2  =  ??         (n= number of terms  a1=first term  an = nth term)

 

2.)   add them all up with calculator....or use

   

        Sum = n (a1+an)/2   =  8 (7.6 + (-1.5) )/2 = ??