Rational numbers are any numbers that terminate (the decimal ends somewhere)
The only set that does this is D, since

All other sets have these:

None of these terminate (the decimals goes on forever), so the answer is D
x=0 is not the solution of this equation
you can put values and can check in these questions
Answer:
The answer would be 70.2.
Step-by-step explanation:
You just have to replace the x in the equation with a 2 because x=2.
Yes it is. If you convert it to a decimal it will be .8 or .80 (Same thing)