The lines are perpendicular because the slopes are negative reciprocals of eachother.
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A: the answer would be 1 i think for part b: 6 part C:72 part D:36 and part E :72
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hope this helps i think im right im not 100% sure but that is kinda confusing
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Step-by-step explanation:A.
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Five times a number plus four times the same number is equal to 360. The number is 40. 5n + 4n = 360; 9n = 360; n = 360/9; n = 40
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