So he worked 30.5 hours, he just didn't write some of the hours down. To find the hours he didn't write down, you subtract 8+

+

from 30.5, which equals
Malaria proved that the equation you need to add the parenthesis first
Answer:
I think the answers is 27, just add all of those squares.
The scale on this map is 1 cm = 500 meters