Multiply.
6.39
× 0.42

  6.39

x 0.42

We can multiply as if it's a normal number and ignore the decimals for now.

    6.39

 x 0.42

    1278

+25560

 26838

Now, we can count the number of places over the decimal is in each number. In 6.39, there are two numbers after the decimal. In 0.42, there are also two numbers. We add those together to get 4. This is how many places over you will put the decimal in 26838.

Therefore, our answer is 2.6838.

268.38

Step-by-step explanation:

Is this helpful for you

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,