X=2+4
34-4=X
100+1000-10

Step-by-step explanation:

2 + 4 = 6     X = 6

34 - 4 = 30 .    X = 30

100 + 1000 = 1100 - 10 = 1090

12m

step-by-step explanation:

square root means have of a number so have of 3 is 1.5 then multiply it by 8 and you get your answer!

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%