PLZ HELP!! Select the correct answer. It would take Charlene and Gina 18 minutes to organize Charlene's comic book collection if they work together. If Gina works alone, it would take her 15 minutes long than it would take Charlene working alone.
When x represents the number of minutes it takes Charlene to organize the comic book collection working alone, the situation is represented by this equation: 1/x +1/x+15=1/18
Which value is a solution of the rational equation that must be discarded because of the context?
A x=0 B. x=-9 C. x=-15 D. X=-30

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 ?