6. Let S = {-1,0, 2, 4, 7}. Find f(S) (image of S under f) where f is from R to R for (a) f(a) = 1 (b) f(a) = 3a + 1 (c) [a/3] (d) [a/4] 7. Find range of the following real functions f: R R. Note that you have to clearly point ou the interval. For example, if given real function f(r) = 2 then range should be fr Lr> 0!

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