Michelle starts a part-time job at a library. For every book she shelves, she earns $0.75 On her first day, before shelving any books, she was given a certain amount as a bonus for joining the team. The function cap e times b is equal to 0 point 7 5 b plus 2 point 5 0 represents her earnings, cap e times x , in dollars based on the number of books, b , she has shelved. What represents Michelle's bonus in the function given?