Could you put the appropriate parenthesis in here? I can make out what b) is supposed to be, but only because I see how to go from b) to c). (Multiply both sides of the equation by (1 + y)^2 and expand.) But I can't make any sense out of how to go from a) to b). There are too many ambiguities in a).

b) 101.22= (112+6y)/(1+y)^2

c) 101.22y^2 +202.44y+101.22= 112+6y

-Dan

PS Oh I get a) now. It's supposed to be

a) 101.22= 6/(1+y) + 106/(1+y)^2

Add the two fractions:

etc.