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.
To decompose the shape, you would draw a vertical line from the vertex that is pointing outside of the shape that has two congruent sides all the way down to the vertex that's inside the shape. By doing this you will create two congruent parallelograms.
They are perpendicular, meaning they have the same slope. We know the slope of both is not zero (neither is vertical). Therefore either 1) Both slopes are positive and therefore the product is positive 2) Both slopes are negative and therefore the product is positive (minus by a minus is a plus)
For the y intercepts, we know that the line P passes through the origin. Therefore its Y intercept is zero. [draw it if this is not obvious and ask where does it cross the y axis] Therefore the Y intercept of line K and line P is zero. [anything multiplied by a zero is a zero]
So we know that the product of slopes is positive, and we know that the product of Y intercepts is zero. So the product of slopes must be greater. Answer A
