First blank: Substitution or transitive property of equality
Second blank: Subtraction property of equality
0.27
so three divided by eleven is 0.27272727272727272727272727272727........so on and so forth.
My work for your question
2
to work it out just go output f (x) - input x so, 3 - 1 = 2 and double check this using your next equations 4 - 2 = 2
11.5 is a rational number