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What number line represents the solution set for the inequality -1/2 greater than or equal to 4

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.

Which image (a’ b’ c’ d’) of abcd cannot he produced using only reflections ?