6. (10 points) Given the function y ( x) = -1 (x+5)3 (a) Plot the function and the line x = -5. (b) What is the left limit of y(x) when x -> -5 from the left? (c) What is the right limit of y(x) when x -> -5 from the right? (d) Does the left limit equal the right limit? (Yes or no) What is the limit of y(x) when x ->-5