The lengths of the sides of a triangle are in the extended ratio 7 : 8 :9 . The perimeter of the triangle is 96 cm. What are t
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For the limit approaching 3 from the right, you want to follow the line to the right of x = 3. From the graph you're describing it sounds like that's y = -3. 
The RHS limit is -3 even though f(3) = 7
The RHS limit is -3 even though f(3) = 7