I need help this makes no sense

m 10 is : 123

m 15 is: 123

m 16 is : 57

Step-by-step explanation:

To get m 10: I subtracted 180-57 and got 123.

To get m 15: I did not need to do anything for that because m10 and m15 are the opposite of each other which means there angle measure is the same.

To get m 16: I did not need to do anything because m9 is the opposite of m 16 which makes their angle measure the same.

in total they made   333.74 your welcome : d