John had 8 blue marbles and 4 red marbles in a bag. He took 1 marble from the bag and then replaced it and then took a second marble. What is the probability that John selected a red marble and then red again?

6/20

step-by-step explanation:

a

step-by-step explanation:

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

correct answer is c. just did it

step-by-step explanation: