(i have two questions in 1 cause i only have 11 points)
(the homework is estimating with 2-digit divisors)

marcy has 567 earmuffs in stock. if she can put 18 earmuffs on each shelf, about how many shelves does she need for all the earmuffs?

(question 2)
howard pays $327 for one dozen collector's edition baseball cards. about how much does he pay for each baseball card?

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 ?