Hellp due today will give brainliest

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

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?

Find the missing dimension! need asap! tiny square is a =3025 in ²