Answer: Irrational
Step-by-step explanation:
The value sqrt(7) is irrational because 7 isn't a perfect square. We cannot write sqrt(7) as a ratio of two integers. In other words, we can't write it into the form a/b where a,b are integers and b is nonzero.
Because sqrt(7) is irrational, so is 5*sqrt(7) for similar reasoning.