Please help & show work it any

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

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6

Sections of prefabricated woods are each 5 1/3 feet long, how long are 7 1/2 sections placed end to end?