Ok last one for today

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39

The graph represents f(x)=[x]+3. what is f(-2.2)?

If a and b are real numbers, then |a-b| is always, sometimes or never equal to |b-a| ?