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What else i can do and write about Puerto Rico

What is the thickest layer of earth called?

Zac wanted to determine the measure of r and of ? r in the triangle below. to fine the measure of r, zac sets up the problem.42^2 + 24^2 = r 2. determine whether zac set the problem up correctly.

What is meant by the last line of the text? how did the maginot line serve as an example of this saying?