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