I need help with question 1, 2, 6, 7 and 8.

What is the missing step in this proof ?

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

Angles 1 and 2 are complimentary angles. angle 1 = 52 degrees. what is the measure of angle 2?