Question 1050744
The sum of 3.8 and twice a number is 12.4<pre>
Substitute the letter x for the words "a number"</pre>The sum of 3.8 and twice x is 12.4<pre>Substitute 2x for the words "twice x"</pre>The sum of 3.8 and 2x is 12.4<pre>Substitute an equal sign "=" for the word "is"</pre>The sum of 3.8 and 2x = 12.4<pre>Substitute 3.8+2x for the words "The sum of 3.8 and 2x"</pre>            3.8+2x = 12.4<pre>Remove the decimals by multiplying every term by 10</pre>
(10)(3.8)+(10)(2x) = (10)(12.4)
          38 + 20x = 124<pre>
Subtract 38 from both sides</pre>
               20x = 86

                 x = 86/20

                 x = 43/10

                 x = 4.3<pre>
Edwin</pre>