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Factor the expression using the gcf. the expression 21m−49n factored using the gcf

What is always true about a positive integer raised to a negative odd power?

Reading tests are compared for two students. sara got 98, 100, 65, 78, 98, 46, 100, 100, 45, and 50 on her reading test. lee got 97, 67, 89, 99, 100, 45, 79, 89, 58, and 67 on his reading test.