What is the main purpose of a speech bubble in a graphic novel

Read the thesis statement below and answer the question that follows. the life of the typical college student is characterized by time spent in many different areas. how can this thesis statement be improved?

Hi how are i have some questions about english subject can you answer for me ?

Kyle and his brother have a marble set of the marbles 12 are blue this represent 50 over a hundred of all the marbles what decimal is equivalent to 50 / 100