Please help i dont get it

x and w are parallel lines, so

• angles 2 and the one labeled 75º are congruent because they are alternating interior angles, and

• angles 1 and 2 are supplementary because they form a linear pair.

The first observation tells you that angle 2 has measure 75º, and angle 1 has measure m such that

m + 75º = 180º

so angle 1 has measure 180º - 75º = 105º.

d. 145*2 is 290 than the total angle is 360 then minus 290 then divide by two

b is the correct answer