The area of the scale drawing would be 1080 square centimeters or (1080 cm^2). I got this answer through first finding the area of the classroom in feet (which is A= lw = [18][20] = 360 ft^2) and then I proceeded to converting it to centimeters via given scale factor (3 cm = 1 foot) and had the answer of 1080 centimeters squared.
Answer:
R=4
Step-by-step explanation:
I think it would be B hope it helps
Answer:

Step-by-step explanation:

So, 
= 
Hope this helps :)