SOLUTION: A sequence of numbers is given below. r, 72, 64, 56, 48, s … (a) Find the values of r and s. (b) Write down an expression for the nth term of the sequence. (c) Write

Algebra ->  Sequences-and-series -> SOLUTION: A sequence of numbers is given below. r, 72, 64, 56, 48, s … (a) Find the values of r and s. (b) Write down an expression for the nth term of the sequence. (c) Write       Log On


   

Question 855716: A sequence of numbers is given below.
r, 72, 64, 56, 48, s …
(a) Find the values of r and s.
(b) Write down an expression for the nth term of the sequence.
(c) Write down the first negative term.
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
The common difference appears to be 8. The sequence decreases by 8 to each consecutive term. r=72%2B8. The n%5Bth%5D term is a%5Bn%5D=r%2B%28-8%29%28n-1%29.

You might try r%2B%28-8%29%28n-1%29%3C0 to help locate which n value becomes the first negative value.