What do you know to be true about the values of a and b

How can we find the measure of an exterior angle if we know the measurement of an interior angle

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

How do you write a paragraph proof to prove that the corresponding angles shown are congruent