Imagine tha the each numeral of the code is written over each line:
__ __ __ __ __ __
1 2 3 4 5 6
Every position may have any of the 10 different numerals.
So over the first line you can put 10 different numerals and the same is true for each of the six positions.
So you can create 10x10x10x10x10x10 = 1,000,000 different codes.
Answer:

Step-by-step explanation:
Let
denote the length of the missing side. Since
and
share one vertex and
, these triangles are similar. This means that:

We now multiply both sides by
and solve the equation:

So we now simply get:

The slope would be 0. Because the line would be flat if all of the y values equal 3, that means the slope = 0. If now x=9 or anything like that, that would be undefined,
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We move all terms to the left:
+31x+32)-((+5)=0
So your answer is 0