How do i find the value of the variable?

the three inside angels need to equal 180, so first find the missing inside angle:

86.5 + 41.4 = 127.9

180-127.9 = 52.1

now that angle and y need to equal 180 degrees

 so 180 - 52.1 = 127.9

y = 127.9 degrees

answer: the answer is 35%

b) well because you get well