The number of members in an organization increases by an average of 150 members annually. There were 4,650 members in 1971. Choose the equation below that gives the approximate number of members, Mn, in the nth year after 1970.
A.
Mn = Mn-1 + 150 for n > 1 ; M1 = 4,500
B.
Mn = Mn-1 + 150 for n > 1 ; M1 = 4,650
C.
Mn-1 = Mn + 150 for n > 1 ; M1 = 4,650
D.
Mn-1 = Mn + 150 for n > 1 ; M1 = 4,500