a) Work out the size of angle x.
b) Give reasons for your answer.
105°

Answer:
m∠x = 75°
Step-by-step explanation:
m∠x and m∠F are corresponding angles.
As lines AD and EH are parallel, m∠x = m∠F
m∠F and 105° form a linear pair
⇒ m∠F + 105° = 180°
⇒ m∠F = 180° - 105° = 75°
As m∠x = m∠F,
⇒ m∠x = 75°