The mean temperature for the first 4 days in January was 8°C. The mean temperature for the first 5 days in January was 6°C.
What was the temperature on the 5th day?

i believe the answer is c.

what is the question? i am guessing you are looking for the area.

to find an area, you have to do length x width.

in this case, it would be 12 ft x 4 ft = 48 sq. ft