Question

HELP!
Find the 40th term of the arithmetic sequence.
–1, –5, –9, –13, –17, ...
−157
−159
−160
−161

Answer 1

A(n)=a+(n-1)d
A(40)= -1+(40-1)-4
A(40)= -1+39(-4)
A(40)= -1+(-156)
A(40)= -157