Will mark brainliest, if answer is correct!

a bag contains 4 blue coins and 8 red coins. a coin is removed at random and replaced by three of the other color.

part 3 out of 3:

if instead the first coin removed is red, what is the probability of drawing a red coin after the three blue coins are put in the bag to replace the red one?

With these 5 geometry questions! pls 1.)quadrilateral abcd is inscribed in this circle. what is the measure of ∠a ? enter your answer in the box.°2.)quadrilateral abcd is inscribed in a circle. what is the measure of angle a? enter your answer in the box. m∠a= 3.)quadrilateral abcd is inscribed in this circle. what is the measure of angle b? enter your answer in the box. m∠b= °4.)quadrilateral abcd is inscribed in this circle. what is the measure of angle a? enter your answer in the box.°5.) quadrilateral abcd is inscribed in this circle. what is the measure of angle c? enter your answer in the box.°