Question 639176

The formula is Sn = (n*(a1 + an))/2


In this case,


a1 = 73


an = -101


n =  30


Plug all this into the formula above to get


Sn = (n*(a1 + an))/2


Sn = (30*(73 + -101))/2


Sn = (30*(-28))/2


Sn = (-840)/2


Sn = -420


So the answer is <font color="red">-420</font>