Let x be the number of lawns you mow and y be the amount of money you earn for it. Then y = kx, where k is the variation constant. For x = 5 we get y = 50, that is, 50 = 5k and k = 10.
The answer is c).
19. The domain of the relation is the set of all values of the x-coordinates of the points A, B, C, D, and E. There are only three such values: 0, 1, and 2.
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