Serena estimates that she can paint 60 square feet of wall space every half -hour .write a equations for the relationship with time i hours as the indecent variables .can serena paint 400 square feet of wall space i. 3.5 hours

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