Janet's dinner costs $7.50. if she wants to leave a 10% tip, how much extra should she leave? i am really stumped on this, give me correct answer

Which of those sequences is a geometric sequence

The parabola opens: y=√x-4 (principal square root) up down right left

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?