Answer:
-110
Step-by-step explanation:
Going from x=1 to 2, y decreases by 3 from 7 to 4
Going from x =2 to 3, y decreases by 3 from 4 to 1
We subtract 3 each time x increases by 1
The formula for an arithmetic sequence is
an = a1 + d(n-1)
where a1 is the first term a1 =7
d is the common difference or what we add (which is in this case is -3)
n is the term number we are looking for n= 40
a40 = 7 -3(40-1)
a40 = 7 -3(39)
a40 = 7 -117
a40 = -110
