Thats my bestfriend coronavirus

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

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?

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply