Answer:
0
Step-by-step explanation:
0÷12=0
The way to figure this problem out is to multiply 0 by 12 and than you get 0.
All you have to do is add those two numbers given and subtract by 180. all of the angles shall add up to 180 if not then you dic something wrong
To find percent error you use the following formula:

% error = (1.6 - 1.9)/1.9 * 100% = 15.79%
The answer $1.72. you divide $24.50 by .07 and the answer comes out to $1.715 and then you round up and have 1.72