Shirley has a credit card that uses the previous balance method. The opening

balance of one of her 30-day billing cycles was $2830, but that was her

balance for only the first 2 days of the billing cycle, because she then paid off

her entire balance and didn't make any new purchases. If her credit card's

APR is 19%, which of these expressions could be used to calculate the

amount Shirley was charged in interest for the billing cycle?

. $0 +28. $2830

B

(0.19

(365

O A. (69• 30)80)

O B. 649.30 20$0 +28 • $2830

O c. (:30) (2•$2830

O D. (1930)82330)

Exercise: counting committees 0.0/2.0 puntos (calificable) we start with a pool of n people. a chaired committee consists of k≥1 members, out of whom one member is designated as the chairperson. the expression k(nk) can be interpreted as the number of possible chaired committees with k members. this is because we have (nk) choices for the k members, and once the members are chosen, there are then k choices for the chairperson. thus, c=∑k=1nk(nk) is the total number of possible chaired committees of any size. find the value of c (as a function of n ) by thinking about a different way of forming a chaired committee: first choose the chairperson, then choose the other members of the committee. the answer is of the form c=(α+nβ)2γn+δ. what are the values of α , β , γ , and δ ?