in an arithmetic sequence the first term is 5 and the fourth term is 40. find the second term.

Please please please, don't give me answers but guide me into getting the answer (:

Question

in an arithmetic sequence the first term is 5 and the fourth term is 40. find the second term.

Please please please, don't give me answers but guide me into getting the answer (:

parthkohli · Answer

Find the arithmetic mean, that'll be the common difference. Then apply the formula.

anonymous · Answer

what do you mean by arithmetic mean?

parthkohli · Answer

The formula for the nth term is:

$\Large \color{Black}{\Rightarrow a_n = a_1 + (n - 1)d }$

parthkohli · Answer

Arithmetic mean of 5, 5 + d, 5 + 2d, 40

anonymous · Answer

OHHHH okay okay.