AP Chem HELP needed

Test Preparation
1

<p>Im justing starting out and I need some help..</p>

<p>How do I represent 37,100,000
a. with one sig figure
b. with two sig figures
c. with three sig figures
d. with six sig figures</p>

<p>Also.. using the correct # of sig figures what is the answer to
I don't even know how to approach this..</p>

<p>(3.8 x 10^-12 + 4 x 10^-13)/(4 x 10^12 + 6.3 x 10^12) = ?????</p>

<p>and</p>

<p>3.14159 x 68/ 5.18 x 10^-11 - 6 x 10^-14</p>

<p>please help me out with this, so I am not lost in class..</p>

<p>I HATE SIG FIGURES!</p>

2

<p>if you're not in the mood.. please atleast help me w/ part of it?</p>

3

<p>a. 4 x 10^7
b. 3.7 x 10^7
c. 3.71 x 10^7
d. 3.71000 x 10^7</p>

<p>(3.8 x 10^-12 + 4 x 10^-13)/(4 x 10^12 + 6.3 x 10^12)= 4 x 10^-25</p>

<p>3.14159 x 68/ 5.18 x 10^-11 - 6 x 10^-14= and I'm not sure if this needs parantheses or what.</p>

4

<p>^^^^^^^^
thank you very much, i appreciate your help :)</p>