# Math Help - Simple Algebra - solving for R

1. ## Simple Algebra - solving for R

Its been awhile since I took a math class, I was reviewing this question but I do not understand where the $4$came from. I understand the rest but I am clueless about that $4$

$4000=1000$ x $(1+r)^5$
$(1+r)^5=4$
$(1+r)=4.0$^(1/5) $=1.32$
$r=.32$

This came from my math book.

2. Originally Posted by killasnake
Its been awhile since I took a math class, I was reviewing this question but I do not understand where the $4$came from. I understand the rest but I am clueless about that $4$

$4000=1000$ x $(1+r)^5$
Divide both sides of the equation by 1000.
$(1+r)^5=4$
$(1+r)=4.0$^(1/5) $=1.32$
$r=.32$

This came from my math book.
~Quacky.

3. If ab = x, then a = x/b OR b = x/a (ab means a times b)