Acamera rental company charges a fixed amount plus a fee based on the number of days for which the camera is rented. the graph below shows the amount paid for a different number of days to rent the camera: a graph titled camera rentals plots the number of days on the x axis and the amount in dollars on the y axis. a straight line joins the ordered pairs 0, 40 and 4, 120. what is the fixed amount charged? $20 $30 $40 $80