Find the 40th term of the arithmetic sequence.-1, -5, -9, -13, -17,

An=a1+d(n-1)
a1=firt term
d=commondifference

-1-4=-5

common difference=-4
first term is -1

an=-1-4(n-1)
40th term
a40=-1-4(40-1)
a40=-1-4(39)
a40=-1-156
a40=-157

40th term is -157

The answer is why would a teacher ask that

The answer is 25uthere is no v in the question