Not sure how to figure this out

How many zeros does the function f(x)=4x3-x2+1 have

The sales totals at macy's food store have increased exponentially over the months. which of these best shows the sales in the first three months?

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