Help me out i would appreciate it

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

Multiply. write your answer in simplest form. 3/8 x 5/7

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?