What is the answer for this ?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15

The measure of an angle is 117°. what is the measure of a supplementary angle?