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?

16/81

Step-by-step explanation:

There are 9 total marbles, meaning the probability of getting a red the first time is 59.

The second time, there are only 4 red marbles and 8 total marbles, so the chance of getting a red on the second time is 12.

The probability of getting 2 reds is 59⋅12=518.

Hope this helped!

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116