Researchers identified 763 women with breast cancer and 741 women without breast cancer. Based on the work histories of these women, researchers concluded that women who work nights have a 60% greater risk of developing breast cancer than women who do not. Is this a survey/observational study or an experiment? How do you know?

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A: The shaded region is bounded by curve y=1/x , y=0 (x-axis) and the vertical lines are x=2 and x=6…

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A: The given matrix is                                C=-3   5  2   6  0-1 We have to find -5C.

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A: Follow the procedure given below.