Can someone please help they're two parts

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.

Biggest exam of the which of the following are polynomial functions?

Nellie is analyzing a quadratic function f(x) and a linear function g(x). will they intersect? f(x) g(x) graph of the function f of x equals one half times x squared, plus 2 x g(x) 1 5 2 10 3 15