Friday

July 25, 2014

July 25, 2014

Posted by **Chelsey** on Saturday, November 17, 2007 at 8:07pm.

I had a_n=-12(3)^(n-1) but that is not a choice on the multiple answers

they have = -12(1/3)^(n-1)

= 12(-1/3)^(n-1)

= -12(-1/3)^(-n+1)

= -12 (-1/3)^(n-1)

- Algebra 2 -
**Michael**, Saturday, November 17, 2007 at 8:15pmWe're dividing by -3, so r (the common ratio) is -1/3. The -1/3 is the number by which we're multiplying the previous term. The common ratio always has to be the number that is MULTIPLIED to get the next term. In this example, (-12)(-1/3) = 4 and 4(-1/3) = -4/3.

The formula for calculating the nth term in a geometric sequence is...

tn = t1 . r^(n - 1)

the nth term = the first term * the common ratio^(n-1)

Just plug in our numbers. The first term is 12, and the common ratio is -1/3.

tn = -12(-1/3)^(n-1)

That's the last option above.

**Related Questions**

matth - hi if the second term of a sequence is root(2) and the seventh term is 8...

Math - Please help. 51. Solve: 125=(x3)/0.3^-3 a.7 b.14 c.15 d.9 53. 49x-2 = 7Ö ...

Algebra - What the general term a_n for the geometric sequence a_1= -5 and a_2= ...

algebra 2/trig - Write the next term of sequence,and then write the rule for the...

algebra - 1)Find the sixth term of the geometric sequence for which a1=5 and r=3...

algebra - 1)Find the sixth term of the geometric sequence for which a1=5 and r=3...

algebra - 1)Find the sixth term of the geometric sequence for which a1=5 and r=3...

geometric series - what is the nth term equation for a geometric sequence with ...

Pre-Cal - 1) Write the first five temrs of the geometric sequence a1 = 2 r=sqrt3...

algebra(check) - 1)Find the sixth term of the geometric sequence for which a1=5 ...