What property is shown below?

5 + (11 + 8) = (5 + 11) + 8

commutative property of multiplication
associative property of multiplication
commutative property of addition
associative property of addition

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

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