we know that
<u>Standard Form</u> is also known as Scientific Notation, is a method of writing numbers that accommodates value excessively large or small to be suitably written in Standard Decimal Notation
in this problem we have

Remember that

so

<u>convert to standard form </u>

therefore
<u>the answer is</u>

Answer:
c = 10
Step-by-step explanation:
The answer is 38,400
The scale is 1:40 so the side that is 4 in becomes 160 and the side that is 6 in becomes 240
Multiply 160 and 240 and that is the area of the room
Hope this helps