Suppose Elena has $5 and sells pens for $1.50 each. Her goal is to save at least $20. Write an inequality to show the number of pens Elena needs to sell to reach her goal. Hint: You may need to use the "relationships"

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