<p>If (1 x 10^n) + (7 + 10^5) = 7.001 x 10^5, what is the value of n?</p>
<p>n= 2</p>
<p>THAT IS EASY</p>
<p>OK, I mean HOW did you arrive at the answer (i.e., what is the explanation for the solution)?? Thanks!</p>
<p>LOOK</p>
<p>7.001x10^5 means 700100</p>
<p>(7 + 10^5) means 700000 plus (1 x 10^n) — you should put the number that will satisfy the upper answer so 10^2 means 100.</p>
<p>I hope that helped.</p>
<p>Good Luck.</p>
<p>7.001 * 10^5 = 700100</p>
<p>700100 = 700000 + 100</p>
<p>700000 = 7 * 100000 = 7 * 10^5</p>
<p>100 = 1 * 10^2</p>
<p>700100 = 70000 + 100 = 7 * 10^5 + 1 * 10^2</p>
<p>n=2</p>
<p>It’s an equation. Subtract 7 from 7.001 and you’re left with .001. 10^n=.001x10^5 => 10^n = 100 => 10^2 = 100 so n=2.</p>
<p>Thanks all for the help!</p>
<p>You could always use the CAS on a TI-89 or graph the function on a TI-83/84.</p>
<p>@314159265 </p>
<p>That is way too much work for this problem… </p>
<p>1 x 10^n = 100</p>
<p>Solve for n…</p>
<p>n = 2</p>
<p>I personally have problems working with scientific notation by hand, so I would use a calculator for this problem. It’s not the fastest, but it’s the most accurate and effective (for me, at least).</p>