Emily wants to go to europe. her plane ticket costs $510 and each day she will pay $120 for a hotel and $60 for food. which of the following equations represents the number of d days she can go if she is williing to pay $2310 for the whole trip? a. 510 + (120 + 60)d = 2310 b. 510 + 120 +60d = 2310 c. 510 + 120d + 60 = 2310 d. 510d + 120d + 60d = 2310

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 ?