Which of the following is rational number?

a.) π

b.) 1.425

c.) √50

d.) √-4

B is the only rational number

a) pi is irrational because it continues without repeating

c) sqrt 50 is irrational because it is the square root of a non perfect square

d) sqrt - 4 is an imaginary number because when you take the square root of a negative you get and answer with i in it.

1.425 because it can be represented as:

1425/1000

A rational number is any number that can be expressed as ratio of two integers ...