Why is the square root of a non perfect square always irrational number ?

The green family is a family of six people. they have used 4,885.78 gallons of water so far this month. they cannot exceed 9,750.05 gallons per month during drought season. write an inequality to show how much water just one member of the family can use for the remainder of the month, assuming each family member uses the same amount of water every month.

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?