Which of the following is the solution to the quadratic equation x2 - x - 42 = 0? a. x = 6, -7 b. x = -6, -7 c. x = -6, 7 d. x = 6, 7

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.

If the probability of an event happening is 65% then the probability this event does not occur?

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 ?