(3 x 10^4) + (2 x 10^3) + (4 x 10^2) =	Choose the correct choice from the following answers.
A) 302400 B) 32400 C) 30240 D) 3240 E) 324
When you multiply a number by 10 you just add a zero   =&gt; 3 x 10^4 =&gt; add 4 zeros =&gt; 3 x 10^4 = 30000   =&gt;2 x 10^3 = 2000   =&gt; 4 x 10^2 = 400   =&gt;3 x 10^4 + 2 x 10^3 + 4 x 10^2 = 30000 + 2000 + 400= 
<gadget id="calculator">30000 + 2000 + 400</gadget>
<output>32_400</output>
32400=&gt; answer is 32400 ( 32400)
<result>B</result>
(3 x 10^4) + (2 x 10^3) + (4 x 10^2) =