No, you can only use the Pythagorean theorem on right triangles.
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When points are being reflected over the x axis you simply multiply the y value by -1. This makes the last option the correct one.
probability of one person owning a dog = 0.66
probability of picking 2 people who own dogs = 0.66 x 0.66 = 0.4356
Round answer as needed.
First find average
(5+5+5+5+7+9)/6=6
now see how much they each are differnt
5 to 6 is 1
5 to 6 is 1
5 to 6 is 1
5 to 6 is 1
7 to 6 is 1
9 to 6 is 3
average those
(1+1+1+1+1+3)/6=8/6=4/3=1.333
answer is 1.33