Posted by Ellie on Sunday, October 25, 2009 at 8:45pm.
-Write the arithmetic sequence 21,13,5,-3... in the standard form:
why isnt this right?
- math - Quidditch, Sunday, October 25, 2009 at 9:00pm
You are close. You have an error:
a_n = 21 + (n - 1) - 8
a_n = 21 + (n - 1) * (-8)
- math - Ellie, Sunday, October 25, 2009 at 9:03pm
oh yeah sorry i wrote that wrong i put -168-8n but it still said my answer was wrong
- math - Quidditch, Sunday, October 25, 2009 at 9:15pm
a_n = 21 + (n-1)*(-8)
Expand that using the distributive law.
The first term, 21, is not multiplied by -8. Only the terms in parenthesis are multiplied by -8.
- math - Ellie, Sunday, October 25, 2009 at 9:54pm
i figured out what i was doing thank you so much!
- math - Quidditch, Sunday, October 25, 2009 at 10:03pm
You're very welcome.
- math - Edward, Sunday, November 30, 2014 at 12:17am
Answer This Question
More Related Questions
- DISCRETE MATH - Determine whether the following is a recursive or explicit. Then...
- Algebra - For the following sequences determine the term indicated: a_1=-2, a_n=...
- Calculus - If a_n>0 and a_(n+1) <= a_n, does the alternating series ∑...
- Algebra II - 1. Which represents the first two terms of the sequence: a_1 = 2 ...
- Calculus - If a_n does not equal zero for any n>=1 and ∑a_n converges ...
- Algebra - find the arithmetic mean A_n-1_-3.9, A_n+1_=7.1
- Calculus - Find a series ∑a_n for which ∑(a_n)^2 converges but ...
- mathematical statistics - Suppose a_n∈ [0,1] and X_n is a sequence of i.i....
- Discrete Math - Solve the recurrence relation a_n = -2a_n-1 + 15a_n-2, n ≥...
- Math Proof - 0<=b_n<=a_n. a) if a_n-->0 then b_n-->0. b) if a_n-->...