Acharter airline finds that on its saturday flights from philadelphia to london, all 120 seats will be sold if the ticket price is $200. however, for each $3 increase in ticket price, the number of seats sold decreases by one. (a) find a formula for the number of seats sold s if the ticket price is p dollars. s(p) = (b) over a certain period, the number of seats sold for this flight ranged between 70 and 115. what was the corresponding range of ticket prices (in dollars)? (enter your answer using interval notation.)