Answer:

Step-by-step explanation:
So we have the expression:

Distribute the negative:

Combine like terms:

And we're done!
Answer:
7s
Step-by-step explanation:
We can combine this because they are like terms.
Answer:
I used Desmos to graph your requirements, and i took a screenshot of the graph. Credit to Desmos for the great graphing system.
Step-by-step explanation:
Answer:
No, It is not irrational number.
Step-by-step explanation:
2/5 is a rational number. A rational number is a number of the form q/q where p and q are integers and q is not equal to 0.