In this case you would set it up as

(180 represents the degree of the triangle)
Add up like terms

Subtract 130 to the other side (180-130)

Divide 10 to the other side ( 50/10)
.

Hope this was clear :)
Answer:
Ill try to help u atleast but if i cant i can explain to u
Step-by-step explanation:
Answer:
200
Step-by-step explanation:
Surface are of cube = 6a^2
Answer:
1. 11 2. 8
Step-by-step explanation:
For number one to find the mean you would first count how many candy bars they have all together and then you would just divide by how many groups there are which since there's four people thats four groups in total they have 44 candy bars because 12+9+10+13=44 which if you divide that by 4 you get 11 as your mean.
For number two you would do the same thing count the total shoe sizes and you should get 40 and since there's 5 people which is five groups it would be 40/5 which means that the total mean would be 8.