Can I please get some help with this and a short explanation

Determine the values of a where the function f (a ) is not continuous. Label each discontinuity as removable, jump or infinite. f (x) = x+3 x>3 Enter your answers as integers in increasing order. If there are no discontinuities, enter NA in both response areas and select continuous in both drop-down menus. If there is only one discontinuity, enter NA in the second response area and select continuous in the second drop-down menu. C = Click for List continuous infinite removable Please explain, in yo jump a few sentences, how you arrived at your answers. Answers with no relevant explanations may receive reduced or no credit