1. 80% of the normal price
2. (2s) x 2+ (s+1) x 2
3. ?
-4x+4x +5y +6y = 17-6
11y=11
divide both side by 11 to isolate y
y=1
4x+6(1) = -6
subtract 6 on both sides
4x=-12
divide 4 on both sides
x=-3
The sum can be rewritten as y=4x, where y=f(x).
Now, we can rewrite the equation a x=y/4
Therefore, inv(f(x))=x/4
1/3=0.33333333 forever
2/3=0.66666666 forever
8/3=3/3+3/3+2/3=1+1+2/3=2+2/3=2+0.66666666=2.666666666666666 forever
