using your f(x) I want to show you how to plug in different things itnot he function.
f(x) = -x + 4
f(1) = -1 + 4 = 3
f(2) = -2 + 4 = 2
f(m) = -m + 4
f(abc) = -(abc) + 4
f(h(x)) = -h(x) + 4
Does that help? what if you replaced h(x) with g(x)? Of course you already have that x so you could make it a little simpler as well. Let me know if you don't quite get it.
Number of shares 1050/10=105 After one year share value 10×(1+0.13)=11.3 After the second year share value 11.3×(1−0.05)=10.735 Total 10.735×105=1,127.175
