How do I find delta in this graph? Calculus homework help

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(2 points) Let f be the function whose graph is given below.

(a). Use this graph to find the largest number delta > 0″> such that</p> <div> (Enter <br /> <b>dne</b> if no such <br /> <img decoding= exists.) 

delta =

(b). Use the graph to find the largest number delta > 0″> such that</p> <div> (Enter <br /> <b>dne</b> if no such <br /> <img decoding= exists.) 

delta =

Please explain!