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

asked Feb 26, 2018 158k views

4 votes

HELP!

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

7.9k points

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3 votes

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

Santosh answered Mar 4, 2018