Please help me understand

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex

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.