Isabella spends 4.87 on paintbrushes and paint. how many of each item does she buy? paint brush cost $0.95

The identity function i behaves just like the number 1. that is (f o i)=f and (i o g)= g it is also true that for a function k, (k o k^-1)=i use this information and algebra to solve h= (f o g) for f any insight would be !