Answer:
3780
Step-by-step explanation:
First we need to find the common difference (d)
d = (37-2)/7 = 5 (7 jumps from term 2 to term 9)
Second we need to find the first term (a1) using the second term
a1 = 2-5 = -3
Third use the sum formula:
Sn = n/2 x (2a1 +d(n-1))
S40 = 40/2 x (2x-3 + 5(40-1)) = 3780
