Question

if the third term in an arithmetic sequence is 7 and the common difference is -5, what is the value of the fourth term?​

Answer 1

t4=a+(n-1)d

t4=7+(4-1)-5

t4=7+(-15)

t4=-8

Answer 2

a₄ = 2

Explanation:

Each term in an arithmetic sequence is obtained by adding the common difference to the previous term, then

a₃ = 7 , so

a₄ = a₃ + 5 = 7 - 5 = 2