There is a bag filled with 4 blue and 5 red marbles.
A marble is taken at random from the bag, the colour is noted and then it is replaced.
Another marble is taken at random.
What is the probability of getting 2 reds?

25

/81

Step-by-step explanation:

5/9 marbles are red

5/9 is the chance for getting one marble. However, twice, you need to multiply it by itself.

The answer is 25/81

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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the ratio of balloons to tables is 5: 2 and the constant variation is 5.

the equation is y=5x