107,867 views
21 votes
21 votes
Find the 13th term of the arithmetic sequence whose common difference is d=7 and whose first term is a1=-3

User Hager
by
2.7k points

1 Answer

22 votes
22 votes

Answer:

81

Explanation:

the formula for an arithmetic sequence:

aₙ = a₁ + (n-1)d

where aₙ = the nth term

a₁ = the 1st term = -3

n = the term number = 13

d = the common difference = 7

Plugging in those values into the formula to find a₁₃:

a₁₃ = -3 + (13-1)7

= -3 + (12)7

= -3 + 84

= 81

User Tomio
by
2.7k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.