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A. The some of two rational numbers is always rational .
Answer:
From given data, University conducted a study of whether running is healthy for men and women over age 50. During the first eight years of the study, 1.9% of the 454members of 50 plus fitn
If the slope of line C is -4, the slope of line D, which is perpendicular to C, is the negative reciprocal of the slope of C: -( 1 / (-4) ), or +1/4.
Note how 1/4 is the native reciprocal of -4, and that -4 is the negative reciprocal of 1/4.
The slope of line D is 1/4.
