Find the sum and choose the correct answer. 2n3 + 4n2 - 7 and -n3 + 8n - 9

A. - n3 - 4 n2 - 8 n - 16
B. n3 + 4 n2 + 8 n + 16
C. 3 n3 + 4 n2 + 8 n - 2
D. n3 + 4 n2 + 8 n - 16

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.