Find the 20th term of the arithmetic sequence 7, 3, - 1, - 5, ...

A. - 73

B. - 69

C. 24

D. 69

7, 3,-1,-5

decreased by 4 each time

arthymetic

an=a1+d (n-1)

a1=first term

d=common diffrence

n=which term

first term is 7

common difference is - 4

an=7-4 (n-1)

for 20th term

a20=7-4 (20-1)

a20=7-4 (19)

a20=7-76

a20=-69

answer is B