A)Work out the size of angle x
B)Give reasons for your answer

Explanation:

Angles ABC and EFG are same side exterior angles. Any pair of same side exterior angles always add to 180 if we have a set of parallel lines like this.

(angle ABC) + (angle EFG) = 180

x + 105 = 180

x = 180-105

x = 75

for the points! : )