A trinket company has a warehouse that contains 50,000'>50,000 trinkets. At the end of each day, a truck picks up 4,000'>4,000 trinkets to deliver to the trinket store. When the warehouse drops below

A trinket company has a warehouse that contains 50,000'>50,000 trinkets. At the end of each day, a truck picks up 4,000'>4,000 trinkets to deliver to the trinket store. When the warehouse drops below 15,000'>15,000 trinkets, the company will begin producing more trinkets to restore the inventory.

1'>1) Write an equation for the number of trinkets T'>T in the factory after D'>D days.

2'>2) After how many days will the factory begin producing trinkets?