you can use calculator because it shows the graph and table.
Answer:
Step-by-step explanation:
42 < 21+3x < 84
21 < 3x < 63
7 < x < 21
You didn't provide answer choices, but since 0.4=4/10 is rational, adding any irrational value to it will produce and irrational sum.
An irrational number is any number which can not be expressed as a fraction of two integers.
