Which number is prime 9 ,10 ,11, 12

11

It is the only number that can only be multiplied by itself and 1 to itself

9 can be multiplied by 3 x 3 = 9 so it isn't prime

10 can be multiplied by 5 x 2 = 10 so it isn't prime

12 can be multiplied by 3 x 4 = 12 so it isn't prime

Hope this helps

Step-by-step explanation:

sorry not sure

step-by-step explanation:

1.3

step-by-step explanation:

3x2=6   9x+6

bring down the 6 on both sides

6+6=12

12= 9x

divide by 9

12/9 =

1.3 =x