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3. {5 points each] Use the definition of continuity and the properties of limits to show that the function is continuous at the given number a. [W f{x)=x3+ 7x. a=4 [b] f(x] = (x+ 2x"}'. a = I 1. (5 points) If f is continuous on (m,m}, what can you sayr about this graph? 2. no points) From the graph of gr shown. state the intervals on which 9 is continuous