Saturday

August 30, 2014

August 30, 2014

Posted by **Christopher** on Wednesday, March 11, 2009 at 9:34pm.

The problem is A1 = 64, Ak+1 = 1/2Ak

(That is supposed to be A sub one, A sub k + 1, etc.)

The formula for finding the equation is:

An = A1 x R^n-1

The answer is:

An = 128(1/2)^n

I cannot figure out what to do and what happens to the n-1 and how it gets to just n.

Help is greatly appreciated. Thanks.

**Related Questions**

Maths - Eric thinks of 2 sequences.One is geometric and the other arithmetic....

Precalc - Find the indicated nth term of the geometric sequence. 7th term a5: -2...

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

Pre-Cal(Please help) - 1) Write the first five temrs of the geometric sequence ...

precalc - Determine whether the sequence is geometric or arithmetic. Then give ...

math - help me with sequences problem.So if the sequence is 2,5,10,17,26 +3 +5 +...

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

Mathematics. Geometric sequences. - 2+4+8+...is a geometric sequence. Prove 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...