Find the derivative of the function f(x)= int cost/t dt

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

Which value of c would make he following expression completely factored? 8x+cy

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?