I need help but it’s easy i’m just dumb

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

Someone me what is the area of this figure? 18m 18m 8m 16m

Twice the sum of a number and 2 is equal to three times the difference of the number and 8. find the number.