The number of boats b a boat dealer sells in each month of the year can be modeled by the function b= -15 |t-5| + 120, where t is the time in months and t =1 represents january. 
1. how much boats sold in march, may, july, september, november, and december?
2. what is the maximum number of sales in one month?
3. in what month is the maximum reached?
4. what is the minimum number of sales in ome month?
5. in what month is the minimum reached?