Is 4/5,2/5,-2/5,-3/5 in order from greatest to least

Yes. Good job! Since negatives are smaller than positives, you automatically know that the last two fall after the first two. Also, if you take a visualization on the number line, you could double check your answer.

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Answer 20 centimeters15+8=2323-3=20so the answer is 20 centimeters