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:

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choice b is correct

step-by-step explanation:

we have been given the following system of linear inequalities;

we are required to graphically determine the solution to these system of inequalities. using a graphing tool, the solution is as shown in the attachment below;

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c