The relationship between a person's age in years and maximum heart rate in beats per minute can be modeled by the equation y = 220 – x, where x is the person's age and y is his or her maximum heart rate. Which of these statements is true according to the model? please i need help ASAP

Answer choices:
A. For each year a person ages, his or her maximum heart rate decreases by 220 beats per minute.
B. For each year a person ages, his or her maximum heart rate increases by 220 beats per minute.
C. For each year a person ages, his or her maximum heart rate decreases by 1 beat per minute.
D. For each year a person ages, his or her maximum heart rate increases by 1 beat per minute

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 ?