13) MK - Without seeing the figures and just being told that Parallelogram ABCD Parallelogram WXYZ, fill in the following blarks. 15) 2X - 16) 2D -- 14) LA - to P 17) LC 18) AB 19) YX - 20) ZW - 21) AD 22) XW D 23) If ZA = 75°, what other angles have to be 75°? 4 А 47 a D 2 47 F 43 43 B C E LA~- LB~ ZF AB ~ N CA

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 ?