Is b=x+(-a) a rational number

No. It's not rational because B is an Irrational number.

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0