Consider the graph of the function {{MATH_15}} {{CMD_16}} {{ENV_17}} {{CMD_18}} Which of the following are true? {{CMD_19}} {{CMD_20}}{{MATH_21}} is continuous at {{MATH_22}}{{CMD_23}} {{CMD_24}}{{MATH_25}} is continuous at {{MATH_26}}{{CMD_27}} {{CMD_28}}{{MATH_29}} is continuous at {{MATH_30}}{{CMD_31}} {{CMD_32}} {{CMD_33}}