Answer:
i think... x=6
Step-by-step explanation:
3x+9=x+21
3x−x=12
2x=12
x=6
I believe it is C because the Associative property states that no matter how you use your parenthesis the answer will be the same <span />
Well, the first place behind the decimal place is tenths, and the second is hundredths, and the third is thousandths, so it would be three thousandths and one tenth
Answer:

Step-by-step explanation:

Step 1: Open the brackets

Step 2: Bring the similar variables together

Step 3: Simplify by adding/subtracting the coefficients of the similar variables

Step 4: Rearrange as required.
Answer:
If you multiply 256 by 10 powered by k, then the number of zeros in the product is k
Step-by-step explanation:
Let x be any integer, if you multiply x by 10 you will have to add one zero at the right of x. If you multiply by 10 again, you will have to add a second zero at the right, thus if you multiply by 100, you will have to add 2 zeros. If you multiply by 1000 = 10*10*10 = 10³ you will have to add 3 zeros and so on.
Therefore, if you multiply 256 by 10^k, then you will have to add k zeros to 256, and as a consequence, the amount of zeros in the product is equal to the power of 10 we are multiplying.