Algebra

Are my answers correct?

8. The first, second, and the nth terms of an arithmetic sequence are 2, 6, and 58 respectively,
i. Find the value of n

n = 15
ii. For that value of n, find the exact value of the sum of n terms.

S_15 = 450

  1. 👍 0
  2. 👎 0
  3. 👁 105
asked by Anon
  1. and this :
    9. The second term of an arithmetic sequence is 7. The sum of the first 4 terms of the arithmetic sequence is 12. Find the first term a1, and the common difference, d, of the sequence.

    answer: d = -8, a = 15

    1. 👍 0
    2. 👎 0
    posted by Anon
  2. Your both answers are completely correct.

    1. 👍 0
    2. 👎 0
    posted by Bosnian

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    Please help. 51. Solve: 125=(x3)/0.3^-3 a.7 b.14 c.15 d.9 53. 49x-2 = 7Ö 7 a.-5/4 b.5/4 c.11/4 d.-11/4 60. Simplify: 2log^3 6 - log^3 4 a.3 b.6 c.4 d.2 61. Solve the equation: logb (x^2 + 7) = 2/3logb 64 a.9 b.3 c. √23 d. ±3

    asked by Holly on May 21, 2013
  2. Algebra

    Use the arithmetic sequence nth term formula to solve the following problem: The first, second, and the nth terms of an arithmetic sequence are 2, 6, and 58 respectively: find the value of n and For that value of n, what is the

    asked by Marss on February 23, 2019
  3. Algebra 1 Honors

    Write an equation for the nth term of the arithmetic sequence. Then graph the first five terms in the Sequence. -3,-8,-13,-18 I got 5n-8 as my formula. Then plugged 5 in for n and got 17 for the 5th number in the sequence. Is this

    asked by Anonymous on January 9, 2016
  4. Math ( Can You check my Work?)

    1.an = 3n - 1 2. an = 2(2n - 3) 3.an = 4^n 4.an = (2/3)^n 5. an = (-1)^n(n + 5) 6. an = (-1)^n + 1(n + 6) 7. an= n+3/2n-1 8. a1 = -5 and an = an-1 - 3 for n ≥ 2 9. a1 = -6 and an = -2an-1 for n ≥ 2 10.a1 = 4 and an = 3an-1 + 2

    asked by Tony on August 1, 2012
  5. Maths

    Hi, I am working on some Nth problems - can anyone tell me if this is correct :- Nth term sequence is n + 4 are the first three terms 5,6,7, A nth term is 85 - 5n are the first three terms of the sequence 17, 34, 51, A nth term is

    asked by Andy on October 1, 2012
  6. Math

    1. What are the next two terms of the following sequence? -3, 1, 5, 9... 2. What are the next two terms of the following sequence? -2, 4, -8, 16... 3. What is the common difference of the following arithmetic sequence? 13, -7,

    asked by Melanie on January 15, 2011
  7. algebra

    can you check my answers please? What are the first three terms of the sequence: a1 = 3 and an = 2(an1)2? 2, 8, 18 3, 18, 648 --3, 32, 50 2, 6, 12, 24 What is the 14th term in the sequence: an = 4n + 13? -43 43 __> -69 69 What is

    asked by Jennifer on March 22, 2012
  8. math...

    how can I tell if a sequences is airthmetic, geometric or neither? determine the first three terms of each and determine if each are airthmetic, geometric or neither. 1) tn=5t n-1+ 3 wheret 1=2 first three terms: 3,13,23

    asked by GEORGE! on October 18, 2006
  9. math

    Hi I need someone to check my answers I'll show whatever work I have but for time purposes I'll just post my answers because I think I have most of them correct. Thanks! 1)Find the 20th term of the arithmetic sequence in which

    asked by Jon on December 12, 2007
  10. Maths

    The first 5 terms of an arithmetic sequence are -2, 5, 12, 19, 26 Find the formula for the nth term of this sequence

    asked by H on May 13, 2019

More Similar Questions