Rose and dennis each open a savings account at the same time. rose invests $2,600 in an account yielding 4.1% simple interest, and dennis invests $2200 in an account yielding 5.7% simple interest. after nine years, who has the greater total amount of money, and how much greater is it? a. rose has $230.80 more than dennis. b. rose has $559.40 more than dennis. c. dennis has $169.20 more than rose. d. dennis has $512.00 more than rose.

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 ?