He makes $375 a week. Since we know he makes the same amount each week, you set up the equation 12m = 4500. To solve, just divide 4500 (total amount made) by the 12 (the amount of weeks) and you get $375 per week.
Im going to guess you want a sinusoidal function. Its been a while but I can tell you most of it (443-28)/2 is the amplitude 28 minutes is the period 40-28 is the horizontal shift (443-28)/2+28 is the vertical shift
