2.23. a farmer has a crop of 2,000 orange trees at the beginning of this year.
each year, the farmer plans to plant 250 new trees. assuming all of the
trees from one year live into the next, which explicit formula below can be
used to determine the total number of orange trees, an' on this farm at the
end of the nth year?
a, = 2,250+250(n-1)
= 2,000+250(n-1)
a = 2,250+250(n +1)
na, = 2,000+ 250(n +1)

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.