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Step-by-step explanation:

q is TFTF

~q use negation, not q so is the opposite of q : FTFT

p↔~q use biconditional ,and will be True only is both statements are T or both are F

p values are TTFF ↔~q values are FTFT : FTTF

(p↔~q )∧~q use conjunction, that is True only if both statements are T

(p↔~q ) values are FTTF ∧~q values are  FTFT : FTFF

(p↔~q )∧~q → p use a conditional statement, where only True False will give a F

(p↔~q )∧~q values are FTFF → p values are TTFF : TTTT

Since, by the definition of exterior angle of an triangle,

b + 60° = 125°

⇒ b = 65°

By the angle sum property of triangle,

a + b + 60° = 180°

⇒ a + 65° + 60° = 180°

⇒ a + 125° = 180°

⇒ a = 55°

By the linear angle postulate,

60° + d + 90° = 180°

d + 150° = 180°

d = 30°

Again, by the angle sum property of triangle,

c + d + 90° = 180°

c + 30° + 90° = 180°

c + 120° = 180°

c = 60°